doc: desc. savelist stash filter in design/NEWS/man doc

Author: xdelaruelle

NEWS.rst

@@ -139,6 +139,8 @@ Modules 5.2.0 (not yet released)
 * Add :subcmd:`stashshow` sub-command to display stash collection file.
 * Add :subcmd:`stashclear` sub-command to delete all stash collection files.
 * Add :subcmd:`stashlist` sub-command to list all stash collection files.
+* Update :subcmd:`savelist` sub-command to filter out stash collections unless
+  if :option:`--all` option is set.
 
 .. _Nagelfar: http://nagelfar.sourceforge.net/
 .. _ShellCheck: https://www.shellcheck.net/

doc/source/design/stash-environment.rst

@@ -244,4 +244,10 @@ Error is obtained and processing stops if:
 
 * stash collection exists but cannot be accessed
 
+savelist sub-command
+--------------------
+
+:subcmd:`savelist` sub-command is adapted to filter out stash collections by
+default. Stash collections are reported if :option:`--all` option is set.
+
 .. vim:set tabstop=2 shiftwidth=2 expandtab autoindent:

doc/source/module.rst

@@ -1840,6 +1840,10 @@ Module Sub-Commands
  *patterns* are given, collection has to match at least one of them to be
  listed.
 
+ Stash collections are not listed unless if the :option:`--all`/:option:`-a`
+ option is set. Stash collections can be listed with :subcmd:`stashlist`
+ sub-command.
+
  .. only:: html
 
     .. versionadded:: 4.0