Normalize the 2014.7.0 release notes

Some parts of the release notes only existed in develop, some only in
2014.7. This commit normalizes develop's copy, as well as fixing some
formatting issues (chiefly among them replacing the use of markdown with
rST).
fix bullet list
Merge pull request #15298 from terminalmage/update-release-notes

Normalize the 2014.7.0 release notes