Docstring and manual updates for completion-at-point-functions.
* doc/lispref/minibuf.texi (Basic Completion): Define "completion table". Move completion-in-region to Completion in Buffers node. (Completion Commands): Use "completion table" terminology. (Completion in Buffers): New node. * doc/lispref/modes.texi (Hooks): add-hook can be used for abnormal hooks too. (Setting Hooks): Update minor mode usage example. (Major Mode Conventions): Note that completion-at-point-functions should be altered locally. Add xref to Completion in Buffers. * lisp/minibuffer.el (completion-at-point-functions): Doc fix.
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