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Adds a comment to the PolicyFetchRequest.policy_type proto field to
document the correct value to use for iOS CBCM policy fetch requests.

Change-Id: I32e720e5cd028d93dc0f0b39904e500500f2a251
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618198Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#841523}