Tweak intersphinx links.

This fixes our various links to point to https and use trailing slashes, and
makes our syntax consistent.

Reviewed at https://reviews.reviewboard.org/r/6381/
Fixed typo in example code for AuthBackendHook.

Changed "=" to "==" to compare instead of assign.

Testing Done:
Ran the code in a python script.

Reviewed at https://reviews.reviewboard.org/r/6386/
Merge branch 'release-2.0.x'