Based on feedback, the purpose of "committer" vs. "author" and "date"

vs. "committer date" wasn't entirely clear, as not all SCMs

differentiated between these.
"date" and "committer date" also seemed to be backwards from general

usage.
To address this:

"committer date" was renamed to "date", and is now the primary date

   representing the change (whether the commit date or when the diff was

   generated).

The old "date" was renamed to "author date", and is now available

   when the date of the authorship (e.g., creation of the diff or

   posting of a review) is available and meaningfully useful.


Descriptions for all these fields were fleshed out, describing their

   intent, purpose, how they differ from each other, when they're

   expected to be present, and what they should contain.

Built the docs. Read through them, checked links, and checked for

spelling errors.