docs(contributing): correction, CLA assistant pushes straight to main branch

Author: igalklebanov

CONTRIBUTING.md

@@ -128,7 +128,7 @@ Simply submit a comment on your PR with the following text:
 I have read the CLA Document and I hereby sign the CLA
 ```
 
-The CLA assistant will automatically add your signature [here](/cla-signs/v1/cla.json) and push a commit to your PR.
+The CLA assistant will automatically add your signature [here](/cla-signs/v1/cla.json) and push a commit to the main branch.
 
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