More updates to misc.texi.
* doc/emacs/misc.texi (Single Shell): Don't document Lisp usage of shell-command. Tidy up discussion of synchronicity. Add index entries for async-shell-command. (Interactive Shell): Note that M-x shell uses shell-file-name. Note change in behavior in Emacs 24. (Shell Mode): Shell mode now uses completion-at-point. (Shell Prompts): Emphasize that comint-use-prompt-regexp isn't the default method for recognizing prompts nowadays. (Shell Ring): Add xref to Minibuffer History. (Directory Tracking): Explain Dirtrack mode in more detail. (Term Mode): Fix index entries. (Paging in Term): Merge into Term Mode. (Serial Terminal, Emacs Server, emacsclient Options): Copyedits. (Printing): Fix xref. State default of lpr-switches. (PostScript): Remove obsolete sentence. Omit description of non-interactive behaviors. (Hyperlinking): Improve description. (Browse-URL): Using compose-mail for mailto URLs is the default. Document browse-url-mailto-function. (Goto Address mode): Add index entries. Add xref to Browse-URL. (FFAP): FFAP is not a minor mode. (Amusements): M-x lm was renamed to M-x landmark. Document nato-region.
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