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Document the formerly-undocumented behavior that schema and comment control-file entries for an extension are honored only during initial installation, whereas other properties are also honored during updates. While at it, do some copy-editing on the recently-added docs for CREATE EXTENSION ... CASCADE, use links for some formerly vague cross references, and make a couple other minor improvements. Back-patch to 9.6 where CASCADE was added. The other parts of this could go further back, but they're probably not important enough to bother.