Merge #11276: [Docs] Update CONTRIBUTING.md to reduce unnecessary review workload

91c39e3 Update CONTRIBUTRING.md to reduce unnecesarry review workload (Jonas Schnelli)

Pull request description:

  The current workload for reviewing pull requests is relatively high and trivial, non-beneficial pull requests tend to slow down the overall development process.

  We may want to directly close trivial, non-beneficially pull requests during time of high pull request load.

  This PR would prepare for possible direct PR closing.

Tree-SHA512: 6a0fb0133e42a400133cc77e4830620c26af4fe5b69f6238e0e77e686d785bd984d85c681a942701e7719de836147e646091a6c492f1d1e2abb906129566082f

Author: MarcoFalke

CONTRIBUTING.md

@@ -157,6 +157,14 @@ behaviour of code within the pull request (bugs must be preserved as is).
 Project maintainers aim for a quick turnaround on refactoring pull requests, so
 where possible keep them short, uncomplex and easy to verify.
 
+Pull requests that refactor the code should not be made by new contributors. It
+requires a certain level of experience to know where the code belongs to and to
+understand the full ramification (including rebase effort of open pull requests).
+
+Trivial pull requests or pull requests that refactor the code with no clear
+benefits may be immediately closed by the maintainers to reduce unnecessary
+workload on reviewing.
+
 
 "Decision Making" Process
 -------------------------