GitLab

I added a sentence defining the intended audience for the "Commit
Checklist for Chromium Workflow" documentation.

Bug: None
Change-Id: Ia2f48d4120e99735c6370c864c52f0b89f6d1feb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846396Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Toby Huang <tobyhuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703893}