🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

CONTRIBUTING.rst

@@ -183,6 +183,16 @@ Updating Conformance Tests
 
 The firestore client libraries use a shared set of conformance tests, the source of which can be found at https://github.com/googleapis/conformance-tests.
 
+To update the copy of these conformance tests used by this repository, run the provided Makefile:
+
+   $ make -f Makefile_v1
+
+**************************
+Updating Conformance Tests
+**************************
+
+The firestore client libraries use a shared set of conformance tests, the source of which can be found at https://github.com/googleapis/conformance-tests.
+
 To update the copy of these conformance tests used by this repository, run the provided Makefile:
 
    $ make -f Makefile_v1