Update gitstream.cm

Fix minor grammatical error in GitHub onboarding example configuration

Author: conorbronsdon

docs/downloads/gitstream.cm

@@ -1,5 +1,5 @@
 # -*- mode: yaml -*-
-# This example configuration for provides basic automations to get started with gitStream.
+# This example configuration provides basic automations to get started with gitStream.
 # View the gitStream quickstart for more examples: https://docs.gitstream.cm/examples/
 manifest:
   version: 1.0