doc: clarify how dropping of extensions affects dependent objs.

Bruce Momjian <bruce@momjian.us>

Commit: 5fe2d4c56edd315780e3c6a00caaa5625a719a87
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-07-14T21:41:03Z
Releases: 16.0
doc:  clarify how dropping of extensions affects dependent objs.

Clarify that functions/procedures are dropped when any extension that
depends on them is dropped.

Reported-by: David G. Johnston

Discussion: https://postgr.es/m/CAKFQuwbPSHMDGkisRUmewopweC1bFvytVqB=a=X4GFg=4ZWxPA@mail.gmail.com

Backpatch-through: 13

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