- Add a GitLab merge request number to the "trust-anchors" release
note and slightly rephrase its second half.
- Replace tabs with spaces in doc/arm/notes-9.15.7.xml to retain
consistency with other XML files containing release notes.
- Move the "Security Fixes" section for BIND 9.15.6 higher up, for
consistency with release notes for other versions.
- Add a missing release note for TCP high-water. That feature was not
yet merged when the initial version of !2524 was prepared and its
release note was missed when that merge request was later rebased.
- Rephrase the release note for CVE-2019-6477 so that it uses the same
text as its corresponding notes in all other releases.
- Unify whitespace in doc/arm/notes-9.15.6.xml.
Intertwining release notes from different BIND releases in a single XML
file has caused confusion in the past due to different (and often
arbitrary) approaches to keeping/removing release notes from older
releases on different BIND branches. Divide doc/arm/notes.xml into
per-version sections to simplify determining the set of changes
introduced by a given release and to make adding/reviewing release notes
less error-prone.
