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Update declarative_content.json docs for minor language and formatting

Bug: none
Change-Id: I254f52f83b42844559da1277070e53ba060153c0
Reviewed-on: https://chromium-review.googlesource.com/1225859Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Meggin Kearney <mkearney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592961}