Update stale comments, and fix comment typos.

Noah Misch <noah@leadboat.com>

Commit: 31d250e049b4e3d51a635edaa2221c11815e40e7
Author: Noah Misch <noah@leadboat.com>
Date: 2019-06-08T17:12:26Z
Releases: 12.0
Update stale comments, and fix comment typos.

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