Only require one approval for minor changes (#6051)

Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>
Co-authored-by: Tim Jacomb <21194782+timja@users.noreply.github.com>

docs/MAINTAINERS.adoc

@@ -374,6 +374,9 @@ LTS backporting, if needed, will be handled separately by the release team.
   Security hardening and enhancements go through the standard process.
 * Release Team members are permitted to bypass the review/merge process if and only if a change is needed to unblock the security release.
   Common review process is used otherwise.
+* Only one approval is required for low-risk small changes with the `skip-changelog` label,
+  as long as both author and approver have write access to the repository.
+  Note that the 24-hour waiting period still applies.
 * 24 hours waiting period after adding the `ready-for-merge` label is not required for:
 //TODO(oleg_nenashev): Define "trivial" better to avoid loopholes
 ** changes that do not result in changes to the primary functionality, such as typo fixes in documentation or localization files