doc: desc. MODULES_REDIRECT_OUTPUT in man/changes

Author: xdelaruelle

doc/source/changes.rst

@@ -794,6 +794,8 @@ The following environment variables appeared on Modules 5.
 |            | :envvar:`__MODULES_QUARANTINE_SET`,                             |
 |            | :envvar:`__MODULES_AUTOINIT_INPROGRESS`                         |
 +------------+-----------------------------------------------------------------+
+| 5.1        | :envvar:`MODULES_REDIRECT_OUTPUT`                               |
++------------+-----------------------------------------------------------------+
 
 Modules Specific Tcl Commands
 """""""""""""""""""""""""""""

doc/source/module.rst

@@ -2624,6 +2624,15 @@ ENVIRONMENT
 
     .. versionadded:: 5.0
 
+.. envvar:: MODULES_REDIRECT_OUTPUT
+
+ If set to ``0``, the output generated by module command is kept on stderr and
+ not redirected to stdout channel.
+
+ .. only:: html
+
+    .. versionadded:: 5.1
+
 .. envvar:: MODULES_RUN_QUARANTINE
 
  A space separated list of environment variable names that should be passed