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[Extensions docs] Update windows.json docs

Update windows.json docs for minor language and formatting

Bug: none
Change-Id: Ia22eb397f79adfced7ba807dcb9243702b8a3935
Reviewed-on: https://chromium-review.googlesource.com/1214162Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: David Gash <dgash@google.com>
Cr-Commit-Position: refs/heads/master@{#595556}