tree fdf8834fb96efd8001c54b0b434bfb93e33bbc9a
parent a98be45882ef4604a6d3c40bd096d2c9c914d597
author shollyman <shollyman@google.com> 1595354332 -0700
committer GitHub <noreply@github.com> 1595354332 -0700
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docs: update CONTRIBUTING.md with some PR setup info (#2619)

Adds an explicit mention to enable "Allow edits by maintainers" when
setting up the pull request.  In PR #2574 (external contribution) it was
discovered this cannot be added after the fact for org-based forks, only
user-based.

As there's not a great reference link for this in the github docs that
doesn't descend into a bunch of organization permissions management, I'm
not calling this specific circumstance explicitly.