docs: fix product documentation url (#19)

Author: twu

README.rst

@@ -16,7 +16,7 @@ Python Client for Cloud Media Translation
    :target: https://pypi.org/project/google-cloud-media-translation/
 .. _Cloud Media Translation API: https://cloud.google.com/docs/media-translation/
 .. _Client Library Documentation: https://googleapis.dev/python/mediatranslation/latest
-.. _Product Documentation:  https://cloud.google.comc/memdia-translation/
+.. _Product Documentation:  https://cloud.google.com/media-translation/
 
 Quick Start
 -----------
@@ -79,4 +79,4 @@ Next Steps
    APIs that we cover.
 
 .. _Cloud Media Translation API Product documentation:  https://cloud.google.com/docs/media-translation
-.. _repository’s main README: https://github.com/googleapis/google-cloud-python/blob/master/README.rst
+.. _repository’s main README: https://github.com/googleapis/google-cloud-python/blob/master/README.rst