fixup docs

Author: dougthor42

Doc/library/difflib.rst

@@ -297,8 +297,9 @@ diffs. For comparing directories and files, see also, the :mod:`filecmp` module.
    For inputs that do not have trailing newlines, set the *lineterm* argument to
    ``""`` so that the output will be uniformly newline free.
 
-   Set *color* to ``True`` to inject ANSI color codes and make the output
-   look like what ``git diff --color`` shows.
+   Set *color* to ``True`` to enable output in color, similar to
+   :program:`git diff --color`. Even if enabled, it can be
+   :ref:`controlled using environment variables <using-on-controlling-color>`.
 
    The unified diff format normally has a header for filenames and modification
    times.  Any or all of these may be specified using strings for *fromfile*,