Add spelling-fix commits section to .git-blame-ignore-revs

Change-Id: I3c2237bf6cba439236c951af4859f382211c5785
Reviewed-on: https://chromium-review.googlesource.com/1104899


Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568129}