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compute_build_timestamp.py was updated to not do 5 am quantizing on
official builds but the behavioral comment at the top was not updated.
This change just updates the comment to reflect reality.

Also fix a spelling error found by tricium.

Bug: 993509
Change-Id: I05e3c03d5846f32a47b7742e01739afd5d4f0564
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154532Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760120}