Looks like this breaks parsing tests list in gtest runner,
which causes deqp_gles2 to fail on Nexus 5X swarmed bot.

Driveby fix of HowToMakeChanges md format.

BUG=angleproject:1471

Change-Id: I6cfa2d9287385aabf2aee47521e5e55e309831c0
Reviewed-on: https://chromium-review.googlesource.com/383813Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>