[3.14] gh-140693: Improve argparse documentation about controlling color (GH-140737) (#140932)

gh-140693: Improve `argparse` documentation about controlling color (GH-140737)
(cherry picked from commit 31de83d)

Co-authored-by: Krishna Chaitanya <[email protected]>

Author: miss-islington

Doc/library/argparse.rst

@@ -639,6 +639,11 @@ by setting ``color`` to ``False``::
    ...                     help='an integer for the accumulator')
    >>> parser.parse_args(['--help'])
 
+Note that when ``color=True``, colored output depends on both environment
+variables and terminal capabilities.  However, if ``color=False``, colored
+output is always disabled, even if environment variables like ``FORCE_COLOR``
+are set.
+
 .. versionadded:: 3.14