doc: explains why Reviewed-By is added in PRs

Adds verbose reasons to the documentation on why the Reviewed-By metadata on a pull request is important. This was loosely mentioned as an issue in the referenced issue below, and answered by @addaleax. Ref: #8893 PR-URL: #9044 Reviewed-By: Myles Borins <[email protected]> Reviewed-By: Stephen Belanger <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>
nodejs · Nov 11, 2016 · 4f8bf1b · 4f8bf1b
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diff --git a/COLLABORATOR_GUIDE.md b/COLLABORATOR_GUIDE.md
@@ -101,6 +101,8 @@ information regarding the change process:
 
 - A `Reviewed-By: Name <email>` line for yourself and any
   other Collaborators who have reviewed the change.
+  - Useful for @mentions / contact list if something goes wrong in the PR.
+  - Protects against the assumption that GitHub will be around forever.
 - A `PR-URL:` line that references the *full* GitHub URL of the original
   pull request being merged so it's easy to trace a commit back to the
   conversation that led up to that change.