I am trying to push my changes in the pinot-docs repo but I am getting this error.

remote: Permission to pinot-contrib/pinot-docs.git denied to tanmesh.
fatal: unable to access '<https://github.com/pinot-contrib/pinot-docs.git/>': The requested URL returned error: 403

Do I need any read/ write permission ? Will really appreciate any suggestion resolving this issue.

You probably need to file the PR from your fork

oh yes! thanks for pointing that.