doc: use exact Lmod version in other-implementation

Express differences between Lmod and Modules by describing the exact
Lmod version used for the comparison, as new feature may appear in new
patch version.

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

Author: xdelaruelle

doc/source/other-implementations.rst

@@ -33,7 +33,7 @@ table highlights features that are unique to each implementation.
 .. list-table::
    :header-rows: 1
 
-   * - Lmod 8.8
+   * - Lmod 8.7.64
      - Modules 5.6
    * - * Integration with *rc* shell and *json* structured output
        * `Lua modulefile support`_
@@ -88,7 +88,7 @@ at the end of this section to map these equivalents.
 .. list-table::
    :header-rows: 1
 
-   * - Lmod 8.8
+   * - Lmod 8.7.64
      - Modules 5.6
    * - ``category``, ``overview``, ``tablelist``
      - :subcmd:`aliases`, :subcmd:`append-path`, :subcmd:`cachebuild`,
@@ -112,7 +112,7 @@ the end of this section to map these equivalents.
 .. list-table::
    :header-rows: 1
 
-   * - Lmod 8.8
+   * - Lmod 8.7.64
      - Modules 5.6
    * - ``remove-property``
      - :mfcmd:`getvariant`, :mfcmd:`is-saved`, :mfcmd:`is-used`,
@@ -133,7 +133,7 @@ implementation.
 .. list-table::
    :header-rows: 1
 
-   * - Lmod 8.8
+   * - Lmod 8.7.64
      - Modules 5.6
    * - `Module properties`_
      - :ref:`Module tags`