Update Killing chapter in Emacs manual. Other misc manual tweaks.
* doc/emacs/killing.texi (Deletion): Add xref to Using Region. (Yanking): Move yank-excluded-properties to Lisp manual. Move C-y description here. Recommend C-u C-SPC for jumping to mark. (Kill Ring): Move kill ring variable documentation here. (Primary Selection): Copyedits. (Rectangles): Document new command rectangle-number-lines. (CUA Bindings): Note that this disables the mark-even-if-inactive behavior for C-x and C-c. * doc/emacs/mark.texi (Mark): Mention "active region" terminology. (Using Region): Document delete-active-region. * doc/lispref/text.texi (Yanking): Document yank-excluded-properties. * doc/lispref/package.texi (Packaging Basics): The commentary should say how to begin using the package.
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