(docs) Add tip on allowing maintainers to edit PR branches (#20979)
(docs) Add tip on allowing maintainers to edit PR branches (#20979)

* Add tip on allowing maintainers to edit PR branches

* Update docs/contributing/gatsby-docs-translation-guide.md

Co-Authored-By: LB <215e3d7c445b99629add69586ce9b88253e8211e@gmail.com>

Co-authored-by: LB <8468275f0d120527324004754c3d088324306866@gatsbyjs.com>

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