Disambiguate function and variable references in docstrings.

Disambiguate function and variable references in docstrings.
* lisp/comint.el (comint-history-isearch-message): Fix ambiguous doc
 string cross-reference(s).

* lisp/ffap.el (ffap-string-at-point-region, ffap-next)
(ffap-string-at-point, ffap-string-around)
(ffap-copy-string-as-kill, ffap-highlight-overlay)
(ffap-literally): Fix ambiguous doc string cross-reference(s).

* lisp/font-lock.el (font-lock-keywords-alist)
(font-lock-removed-keywords-alist): Fix ambiguous doc string
        cross-reference(s).

* lisp/help-mode.el (help-xref-symbol-regexp): Add "call" as a hint for
a cross-reference to a function.

* lisp/info.el (Info-find-emacs-command-nodes): Fix ambiguous doc
 string cross-reference(s).

* lisp/isearch.el (isearch-message-function, isearch-fail-pos): Fix
 ambiguous doc string cross-reference(s).

* lisp/misearch.el (multi-isearch-next-buffer-function): Fix ambiguous
 doc string cross-reference(s).

* lisp/newcomment.el (comment-box): Fix ambiguous doc string
 cross-reference(s).

* lisp/printing.el (pr-txt-printer-alist, pr-ps-printer-alist)
(pr-setting-database): Fix ambiguous doc string
 cross-reference(s).

* lisp/ps-print.el (ps-even-or-odd-pages, ps-spool-buffer-with-faces)
(ps-n-up-filling-database): Fix ambiguous doc string
 cross-reference(s).

* lisp/server.el (server-buffer, server-log): Fix ambiguous doc string
 cross-reference(s).

* lisp/simple.el (newline, delete-backward-char, delete-forward-char)
(minibuffer-history-isearch-message, kill-line, track-eol)
(temporary-goal-column): Fix ambiguous doc string
 cross-reference(s).

* lisp/whitespace.el (whitespace-point)
(whitespace-font-lock-refontify, whitespace-bob-marker)
(whitespace-eob-marker): Fix ambiguous doc string
 cross-reference(s).

* lisp/calc/calc.el (calc-highlight-selections-with-faces)
 (calc-dispatch): Fix ambiguous doc string cross-reference(s).

* lisp/emacs-lisp/edebug.el (edebug-read, edebug-eval-defun): Fix
 ambiguous doc string cross-reference(s).

* lisp/gnus/gnus-start.el (gnus-check-new-newsgroups): Fix ambiguous doc string
 cross-reference(s).

* lisp/gnus/gnus-sum.el (gnus-summary-newsgroup-prefix): Fix ambiguous doc string
 cross-reference(s).

* lisp/international/mule.el (add-to-coding-system-list): Fix ambiguous
 doc string cross-reference(s).

* lisp/progmodes/cc-fonts.el (c-font-lock-keywords-3)
(c++-font-lock-keywords-3, objc-font-lock-keywords-3)
(java-font-lock-keywords-3, idl-font-lock-keywords-3)
(pike-font-lock-keywords-3): Fix ambiguous doc string
 cross-reference(s).

* lisp/progmodes/compile.el (compile): Fix ambiguous doc string
 cross-reference(s).

* lisp/progmodes/etags.el (tags-table-files)
(tags-table-files-function, tags-included-tables-function): Fix
 ambiguous doc string cross-reference(s).

* lisp/progmodes/gdb-mi.el (gdb, gdb-setup-windows)
(gdb-restore-windows): Fix ambiguous doc string
 cross-reference(s).

* lisp/textmodes/flyspell.el (flyspell-mark-duplications-flag)
(flyspell-default-deplacement-commands): Fix ambiguous doc string
 cross-reference(s).

* lisp/textmodes/ispell.el (ispell-accept-output): Fix ambiguous doc
 string cross-reference(s).

* lisp/textmodes/sgml-mode.el (html-tag-help): Fix ambiguous doc string
 cross-reference(s).

* lisp/vc/compare-w.el (compare-ignore-whitespace)
(compare-ignore-case, compare-windows-dehighlight): Fix ambiguous
 doc string cross-reference(s).

* lisp/vc/diff.el (diff): Fix ambiguous doc string cross-reference(s).

* src/insdel.c (Fcombine_after_change_execute, syms_of_insdel): Fix
 ambiguous doc string cross-reference(s).

* src/keyboard.c (Fcommand_execute, syms_of_keyboard): Fix ambiguous
 doc string cross-reference(s).

* src/window.c (Fwindow_point, syms_of_window): Fix ambiguous doc
 string cross-reference(s).

Fixes: debbugs:12686