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Fix typos and improve text in enterprise policy documentation

Bug: 1022143

Change-Id: I5ff3ade372059ef4faabe904ae85582de2339d54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089692
Commit-Queue: Jana Grill <janagrill@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748212}