Improve documentation for datagrid sidebars.

Review Request #9286 — Created Oct. 18, 2017 and submitted — Latest diff uploaded

Information

Review Board
release-3.0.x
739e338...

Reviewers

This fixes up the documentation for reviewboard.datagrids.sidebar to
better document the various methods, attributes, and parameters for all
functionality used for providing custom sections and items for the
Dashboard, User Page, and custom datagrids containing sidebars. The new
documentation better corresponds to our modern guidelines.

Built the docs and looked through them. There were no build errors and
the generated docs seemed correct.