Update docs for a bunch of 24.3 changes.
* doc/emacs/killing.texi (Rectangles): Document copy-rectangle-as-kill. * doc/emacs/search.texi (Special Isearch): Document the lax space search feature and M-s SPC. (Regexp Search): Move main search-whitespace-regexp description to Special Isearch. (Replace): Document replace-lax-whitespace. * doc/emacs/basic.texi (Position Info): Document C-u M-=. (Moving Point): Document move-to-column. * doc/emacs/display.texi (Useless Whitespace): Add delete-trailing-lines. * doc/emacs/misc.texi (emacsclient Options): Document the effect of initial-buffer-choice on client frames. Document server-auth-dir. Do not document server-host, which is bad security practice. * doc/emacs/building.texi (Lisp Libraries): Docstring lookups can trigger autoloading. Document help-enable-auto-load. * doc/emacs/mini.texi (Yes or No Prompts): New node. * doc/emacs/ack.texi (Acknowledgments): Remove obsolete packages. * doc/lispref/commands.texi (Click Events): Define "mouse position list". Remove mention of unimplemented horizontal scroll bars. (Drag Events, Motion Events): Refer to "mouse position list". (Accessing Mouse): Document posnp. * doc/lispref/errors.texi (Standard Errors): Tweak arith-error description. Tweak markup. Remove domain-error and friends, which seem to be unused after the floating-point code revamp. * doc/lispref/functions.texi (Obsolete Functions): Obsolescence also affects documentation commands. Various clarifications. (Declare Form): New node. * doc/lispref/loading.texi (Autoload): * doc/lispref/help.texi (Documentation Basics): The special sequences can trigger autoloading. * doc/lispref/macros.texi (Defining Macros): Move description of `declare' to Declare Form node. * doc/lispref/numbers.texi (Integer Basics): Copyedits. (Float Basics): Consider IEEE floating point always available. (Random Numbers): Document actual limits. (Arithmetic Operations): Clarify division by zero. Don't mention the machine-independence of negative division since it does not happen in practice. * doc/lispref/os.texi (Idle Timers): Minor clarifications. (User Identification): Add system-users and system-groups. * doc/lispref/strings.texi (String Basics): Copyedits. * lisp/minibuffer.el (minibuffer-local-filename-syntax): Doc fix. * lisp/server.el (server-host): Document the security implications. (server-auth-key): Doc fix. * lisp/startup.el (initial-buffer-choice): Doc fix. * src/fns.c (Frandom): Doc fix.
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