This would be a break in tradition. We don't (or haven't in the past)
done release notes for point releases, as they are normally only
bugfixes and/or security updates.
I can see three possiblities here:
1. Mark the feature as 'versionadded:1.2" in trunk; in the 1.1.X
branch, mark it 'versionadded:1.1', but with an explanatory note
clarifying that strictly, it's 1.1.2.
2. Mess around with the Sphinx processor and make it display point
release numbers but link to the minor release.
3. Actually create a 1.1.2 release notes document, whose sole purpose
is to document this extraordinary feature.
I don't have any preference on the color of this particular bikeshed.
If pressed, I'd probably say option 3.
Regarding the issue of whether this is the only reference failure in
the docs - there is actually one other; the 1.2 release notes aren't
listed in the release notes index file.
Yours,
Russ Magee %-)