Add release notes for Review Board 2.5.2.
Review Request #7791 — Created Dec. 3, 2015 and submitted — Latest diff uploaded
This covers the various bug fixes for image review, GitLab, webhooks, condensediffs, e-mails, and more, along with the new helpful instructions for getting GitHub Enterprise or TFS repositories configured.
Built the docs and tested the links. Didn't see any errors.