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This change fills in some missing documentation. I ran a spell
checker throughout traffic auditor code and corrected a bunch of
miscellaneous typos as well :)

Bug: 1005537
Change-Id: I1dab786db686370e2271828089ac336dbc048913
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814721
Commit-Queue: Nicolas Arciniega <niarci@microsoft.com>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704330}