Resolve "Add hyperlink to [GL XXXX] labels in documentation"

Release Notes with hyperlinked [GL XXXX] labels:

• HTML: https://isc-projects.isc-pag.es/-/bind9/-/jobs/1660868/artifacts/doc/arm/_build/html/notes.html#notes-for-bind-9-17-12
• PDF: https://gitlab.isc.org/isc-projects/bind9/-/jobs/1660868/artifacts/file/doc/arm/_build/latex/Bv9ARM.pdf

Closes #2372 (closed)