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Also update description_guidelines.md to have a ph tag for Android.

Bug: 1137865
Change-Id: Icfe0fff13d54e7c72003196c587dd3414ff8b129
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2562219
Commit-Queue: Chris Sharp <csharp@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832059}