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This CL clarifies that {Included,Excluded}Routes can be used for
any network Type and describes the default routing behavior for
each Type.

Bug: 1038601
Change-Id: Ibb1cf5fba164f416b31f3b22d81c4105639839da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037318
Commit-Queue: Alex Khouderchah <akhouderchah@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738606}