Add test note to contribution guidelines

Author: MashaMSFT

docs/sql-server/sql-server-docs-contribute.md

@@ -129,3 +129,5 @@ Explore the [sql-docs repository](https://github.com/MicrosoftDocs/sql-docs) on
 Find an article, submit a change, and help the SQL Server community.
 
 Thank you.
+
+test