fix(upgrade): Corrects query to clear admin remember me cookies
Merge pull request #6773 from mrclay/fix_clear_codes

fix(upgrade): Corrects query to clear admin remember me cookies
docs(contribute): clean up PR instructions
docs(contribute): add instructions for rewriting commit messages

Refs #5976
Merge pull request #6781 from ewinslow/docs-contribute-code

docs(contribute): clean up PR instructions