Edit PhishGuard enterprise policies based on feedback from launch review

A couple of edits on enterprise policies based on feedback we got in
launch review.

Bug: 845038
Change-Id: Ie5536e9ce9a197d1b562571e5f247d58049234be
Reviewed-on: https://chromium-review.googlesource.com/1130506
Commit-Queue: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573845}
1 file changed