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run_blink_wptserve.py has no way of knowing which gen/ directory
to serve files from. Document this fact.

R=qyearsley@chromium.org

Change-Id: Ia5caef49b7333e695665ca921790c4dedb30ac22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2217275
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774058}