GitLab

During the wiki->docs/*.md conversion, someone added a bunch of TODO
comments and then never acted on them.  Since having TODOs in documentation
is pretty gross and since the TODOs don't make much sense, remove them.

BUG=none
R=hans@chromium.org

Review URL: https://codereview.chromium.org/1636073003 .

Cr-Commit-Position: refs/heads/master@{#371532}