This mostly changes simple typos, e.g.:
strack->stack
assosiated->associated
unsettin->unsetting
diangose->diagnose
desciption->description
commment->comment

This CL also changes some docstrings and capitalizes
some printed messages.

Change-Id: I758b47f069a6de2d0d94a76ff85587bdc51c9daf
Reviewed-on: https://chromium-review.googlesource.com/519614
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>