Update CONTRIBUTING.md

Clarify googler PR policy
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b52f8ee..b9b81ec 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,7 +20,8 @@
 accept your pull requests.
 
 ## Are you a Googler?
-If you are a Googler, you can either create an internal change or work on GitHub directly.
+If you are a Googler, plese make an attempt to submit an internal change rather than a GitHub Poll Request. 
+If you are not able to submit an internal change a PR is acceptable as an alternative. 
 
 
 ## Contributing A Patch