Improve introductory comment in sample script (#144)

Add link to this repository and improve wording.

Author: StanFromIreland

sample-workflows/transifex-util.py

@@ -1,9 +1,10 @@
 #!/usr/bin/env python
 #
-# This python file contains utility scripts to manage Python docs translation
-# on Transifex.
-#
-# Inspired by django-docs-translations script by claudep.
+# This python file contains utility functions to manage a Python docs translation
+# with Transifex.
+# 
+# This file is maintained at: https://github.com/python-docs-translations/transifex-automations/blob/main/sample-workflows/transifex-util.py
+
 import configparser
 from argparse import ArgumentParser
 import os
@@ -111,4 +112,4 @@ def _get_tx_token() -> str:
     PROJECT_SLUG = options.project_slug
     VERSION = options.version
 
-    globals()[options.cmd]()
+    globals()[options.cmd]()