Added a note for committers on formatting commit messages generated by ./rbt patch
Added a note for committers on formatting commit messages generated by ./rbt patch

Reviewed at https://reviews.apache.org/r/41743/

rdelval/aurora,medallia/aurora,crashlytics/aurora,crashlytics/aurora,thinker0/aurora,apache/aurora,protochron/aurora,crashlytics/aurora,rdelval/aurora,apache/aurora,apache/aurora,rdelval/aurora,thinker0/aurora,crashlytics/aurora,medallia/aurora,protochron/aurora,rdelval/aurora,apache/aurora,protochron/aurora,medallia/aurora,thinker0/aurora,crashlytics/aurora,protochron/aurora,protochron/aurora,medallia/aurora,thinker0/aurora,rdelval/aurora,medallia/aurora,thinker0/aurora,rdelval/aurora,thinker0/aurora,protochron/aurora,apache/aurora,crashlytics/aurora,medallia/aurora,apache/aurora