notify @github/octokit-maintainers about changes in REST APIs (github…

…#15960)

We had the same thing to the last docs repository (github/internal-developer.github.com#4800), it was very helpful. Would that be possible? I think the overhead to this solution is to add members from @docs-engineering to @octokit-maintainers, so that no review is required from me or other future Octokit maintainers

Co-authored-by: Zeke Sikelianos <[email protected]>

.github/CODEOWNERS

@@ -14,3 +14,7 @@ package-lock.json @github/docs-engineering
 package.json @github/docs-engineering
 
 /content/github/site-policy/ @github/site-policy-admins
+
+# Make sure that Octokit maintainers get notified about changes
+# relevant to the Octokit libraries (https://github.com/octokit)
+/content/rest/reference @github/octokit-maintainers