Adjust merge request template, recommend to merge fixes directly to stable

.gitlab/merge_request_templates/Merge request.md

@@ -1,6 +1,8 @@
 Please avoid merging the base branch into your feature branch. We are working with rebases and those merged tend to cause trouble. 
 For further questions, join us at Matrix: https://matrix.to/#/#funkwhale-dev:matrix.org
 
+If your contribution is fixing an issue by a small change, please consider a merge into `stable` by using it as target branch.
+
 Related issue: #XXX <!-- it's okay to have no issue for small changes -->
 
 This Merge Request includes: