Fix bug description for #67432
Typos / Format fixes
Add an entry for bug#66060 (fixed in 5.5.8)
Use #66356 instead of #66714, as the latter is only a regression fix from the former.
Add CVE IDs for 5.6.0
Fix phrasing, per Chris.
Convert all bug references to use bugfix and bugl for 5.6.0