Minor documentation change to webapi resource model (File attachment/Screenshot comment)

1. /reviewboard/webapi/resources/file_attachment_comment.py: typo "filess"

2. /reviewboard/webapi/resources/review_file_attachment_comment.py: file
   attachment comments do not contain dimension infomation, while screenshot
   comments do have.

3. /reviewboard/webapi/resources/screenshot_comment.py: apparently these should
   be comments on a screenshot.

Testing Done:
No testing required.

Reviewed at https://reviews.reviewboard.org/r/6528/
Add missing resources to the resources index in the docs.

The draft-original-file and draft-patched-file resources were missing
from the categorized resources index in the docs. This is a trivial fix
that adds them.
Fix several issues with doc generation.

This fixes the generation of docs, due to a change in the 'password'
field for repositories.

It also fixes several bad references and other harmless warnings found
when generating docs from scratch.

Reviewed at https://reviews.reviewboard.org/r/6527/
Show added_in/deprecated_in/removed_in for fields in the API docs.

We've been tagging fields with added_in/deprecated_in (and may soon use
removed_in) in the API field lists, but we haven't shown these in the
docs. These are now displayed along with the field description.

Reviewed at https://reviews.reviewboard.org/r/6529/g
Fix a JavaScript test discrepency between Firefox and Chrome.

On Firefox, the tests for reloading the New Review Request view failed,
due to a different CSS display value being used when showing the
branches view. Since Chrome and Firefox disagree here, and what we
really care about is that it's being shown again, we can just test that
it's not "display: none".

Reviewed at https://reviews.reviewboard.org/r/6534/