sync: consistently use article "a" for RWMutex

We used a mix of both before.

I've never heard anybody say "an arr-double you mutex" when speaking.

Fixes #23457

Change-Id: I802b5eb2339f885ca9d24607eeda565763165298
Reviewed-on: https://go-review.googlesource.com/87896
Reviewed-by: Andrew Bonventre <andybons@golang.org>
2 files changed
tree: 6cf494b5027293e552fd1b6fc1c14b640d9a7ca4
  1. .github/
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  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
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