Document x-enum-varnames and x-enum-descriptions as vendor extensions
Description
Add x-enum-varnames
and x-enum-descriptions
to documentation.
Related issues/PRs
Introduced via #1752, x-enum-descriptions
should be added to the new doc site which will be introduced by #1770.
While reviewing #1752, I also noticed x-enum-varnames
which is not accounted for in the existing docs that I had migrated to the docusaurus site. Once #1770 is merged, these should be documented in docs/templating.md
.