The new :cve: Sphinx role takes a CVE number as an argument and creates
a hyperlink to the relevant ISC Knowledgebase document that might have
more up-to-date or verbose information than the relevant release note.
This makes reaching ISC Knowledgebase pages directly from the release
notes easier.
Make all CVE references in the release notes use the new Sphinx role.
From now on all per-version notes link to the global list
of Known Issues. If there is a new note it should be listed twice:
In the per-version list, and in the global list.
