Parser: Drop epilog message for Sphinx help

When calling `tox.config.cli.parse._get_parser_doc()` from the Sphinx
documentation build, reset the `.epilog` property on the returned
parser object. This ensures the help will be formatted without any
messages about configuration files.

Fixes #3585

Signed-off-by: FeRD (Frank Dana) <[email protected]>

Author: ferdnyc

src/tox/config/cli/parse.py

@@ -91,7 +91,10 @@ def _get_parser_doc() -> ToxParser:
 
     MANAGER.load_plugins(Path.cwd())
 
-    return _get_parser()  # pragma: no cover
+    parser = _get_parser()  # pragma: no cover
+    # Remove epilog message from help when formatting website docs
+    parser.epilog = None
+    return parser
 
 
 __all__ = (