message: build: update contributing guide to reflect branch name of `code-of-conduct` repository
  Updates the contributing guide to reflect the branch name of `code-of-conduct` repository
diff: @@ -230,7 +230,7 @@ changes to be accepted, the CLA must be signed. It's a quick process, we promise
  - For corporations we'll need you to
  [print, sign and one of scan+email, fax or mail the form][corporate-cla].
  -[coc]: https://github.com/angular/code-of-conduct/blob/master/CODE_OF_CONDUCT.md
  +[coc]: https://github.com/angular/code-of-conduct/blob/main/CODE_OF_CONDUCT.md
  [commit-message-format]: https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#
  [corporate-cla]: http://code.google.com/legal/corporate-cla-v1.0.html
  [dev-doc]: https://github.com/angular/angular/blob/main/DEVELOPER.md
  