Merge pull request #17041 from cho-m/docs-linux-only-label

docs: update info as `linux-only` labels are automerged

Author: ZhongRuoyu

docs/Homebrew-homebrew-core-Maintainer-Guide.md

@@ -23,7 +23,7 @@ Homebrew is about Unix software. Stuff that builds to an `.app` should be in Hom
 
 For most PRs that make formula modifications, you can simply approve the PR and an automatic merge (with bottles) will be performed by [@BrewTestBot](https://github.com/BrewTestBot). See [BrewTestBot for Maintainers](BrewTestBot-For-Maintainers.md) for more information.
 
-Certain PRs may not be merged automatically by [@BrewTestBot](https://github.com/BrewTestBot), even after they've been approved. This includes PRs with the `new formula`, `automerge-skip`, and `linux-only` labels. To trigger a merge for these PRs, run `brew pr-publish`.
+Certain PRs may not be merged automatically by [@BrewTestBot](https://github.com/BrewTestBot), even after they've been approved. This includes PRs with the `new formula` and `automerge-skip` labels. To trigger a merge for these PRs, run `brew pr-publish`.
 
 PRs modifying formulae that don't need bottles or making changes that don't require new bottles to be pulled should use GitHub's squash & merge or rebase & merge workflows.