Added more info about PR prep to CONTRIBUTING.md file#948

jasnow wants to merge 2 commits into

rubysec:masterrubysec/ruby-advisory-db:masterfrom

jasnow:ghsa-syncbot-2026-01-08-09_58_28jasnow/ruby-advisory-db:ghsa-syncbot-2026-01-08-09_58_28Copy head branch name to clipboard