doc: remove use of ⦁ unicode char

Replace "⦁" with "x" in modulefile man page to be able to build a PDF
documentation file.

Signed-off-by: Xavier Delaruelle <[email protected]>

Author: xdelaruelle

doc/source/modulefile.rst

@@ -2396,37 +2396,37 @@ changes that are supported by the shells supported by :file:`modulecmd.tcl`.
 |        | :mfcmd:`prepend-path`,|                      |                         |                     |                |                     |
 |        | :mfcmd:`remove-path`) |                      |                         |                     |                |                     |
 +========+=======================+======================+=========================+=====================+================+=====================+
-| sh     | ⦁                     | ⦁                    | ⦁                       |                     | ⦁              | ⦁                   |
+| sh     | x                     | x                    | x                       |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| bash   | ⦁                     | ⦁                    | ⦁                       | ⦁                   | ⦁              | ⦁                   |
+| bash   | x                     | x                    | x                       | x                   | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| ksh    | ⦁                     | ⦁                    | ⦁                       |                     | ⦁              | ⦁                   |
+| ksh    | x                     | x                    | x                       |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| zsh    | ⦁                     | ⦁                    | ⦁                       |                     | ⦁              | ⦁                   |
+| zsh    | x                     | x                    | x                       |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| csh    | ⦁                     | ⦁                    |                         |                     | ⦁              | ⦁                   |
+| csh    | x                     | x                    |                         |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| tcsh   | ⦁                     | ⦁                    |                         | ⦁                   | ⦁              | ⦁                   |
+| tcsh   | x                     | x                    |                         | x                   | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| fish   | ⦁                     | ⦁                    | ⦁                       | ⦁                   | ⦁              | ⦁                   |
+| fish   | x                     | x                    | x                       | x                   | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| cmd    | ⦁                     | ⦁                    |                         |                     | ⦁              |                     |
+| cmd    | x                     | x                    |                         |                     | x              |                     |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| pwsh   | ⦁                     | ⦁                    | ⦁                       | ⦁                   | ⦁              |                     |
+| pwsh   | x                     | x                    | x                       | x                   | x              |                     |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| python | ⦁                     |                      |                         |                     | ⦁              | ⦁                   |
+| python | x                     |                      |                         |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| perl   | ⦁                     |                      |                         |                     | ⦁              | ⦁                   |
+| perl   | x                     |                      |                         |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| ruby   | ⦁                     |                      |                         |                     | ⦁              | ⦁                   |
+| ruby   | x                     |                      |                         |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| tcl    | ⦁                     |                      |                         |                     | ⦁              | ⦁                   |
+| tcl    | x                     |                      |                         |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| cmake  | ⦁                     |                      |                         |                     |                | ⦁                   |
+| cmake  | x                     |                      |                         |                     |                | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| r      | ⦁                     |                      |                         |                     | ⦁              | ⦁                   |
+| r      | x                     |                      |                         |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
-| lisp   | ⦁                     |                      |                         |                     | ⦁              | ⦁                   |
+| lisp   | x                     |                      |                         |                     | x              | x                   |
 +--------+-----------------------+----------------------+-------------------------+---------------------+----------------+---------------------+
 
 The :mfcmd:`source-sh` command evaluates a shell script and produces the