Fix minor quoting problems in doc strings

Fix minor quoting problems in doc strings

These were glitches regardless of how or whether we tackle the
problem of grave accent in doc strings.
* lisp/calc/calc-aent.el (math-restore-placeholders):
* lisp/ido.el (ido-ignore-buffers, ido-ignore-files):
* lisp/leim/quail/cyrillic.el ("bulgarian-alt-phonetic"):
* lisp/leim/quail/hebrew.el ("hebrew-new")
("hebrew-biblical-sil"):
* lisp/leim/quail/thai.el ("thai-kesmanee"):
* lisp/progmodes/idlw-shell.el (idlwave-shell-file-name-chars):
Used curved quotes to avoid ambiguities like ‘`''’ in doc strings.
* lisp/calendar/calendar.el (calendar-month-abbrev-array):
* lisp/cedet/semantic/mru-bookmark.el (semantic-mrub-cache-flush-fcn):
* lisp/cedet/semantic/symref.el (semantic-symref-tool-baseclass):
* lisp/cedet/semantic/tag.el (semantic-tag-copy)
(semantic-tag-components):
* lisp/cedet/srecode/cpp.el (srecode-semantic-handle-:cpp):
* lisp/cedet/srecode/texi.el (srecode-texi-texify-docstring):
* lisp/emacs-lisp/byte-opt.el (byte-optimize-all-constp):
* lisp/emacs-lisp/checkdoc.el (checkdoc-message-text-engine):
* lisp/emacs-lisp/generator.el (iter-next):
* lisp/gnus/gnus-art.el (gnus-treat-strip-list-identifiers)
(gnus-article-mode-syntax-table):
* lisp/net/rlogin.el (rlogin-directory-tracking-mode):
* lisp/net/soap-client.el (soap-wsdl-get):
* lisp/net/telnet.el (telnet-mode):
* lisp/org/org-compat.el (org-number-sequence):
* lisp/org/org.el (org-remove-highlights-with-change)
(org-structure-template-alist):
* lisp/org/ox-html.el (org-html-link-org-files-as-html):
* lisp/play/handwrite.el (handwrite-10pt, handwrite-11pt)
(handwrite-12pt, handwrite-13pt):
* lisp/progmodes/f90.el (f90-mode, f90-abbrev-start):
* lisp/progmodes/idlwave.el (idlwave-mode, idlwave-check-abbrev):
* lisp/progmodes/verilog-mode.el (verilog-tool)
(verilog-string-replace-matches, verilog-preprocess)
(verilog-auto-insert-lisp, verilog-auto-insert-last):
* lisp/textmodes/makeinfo.el (makeinfo-options):
* src/font.c (Ffont_spec):
Fix minor quoting problems in doc strings, e.g., missing quote,
``x'' where `x' was meant, etc.
* lisp/erc/erc-backend.el (erc-process-sentinel-2):
Fix minor quoting problem in other string.
* lisp/leim/quail/ethiopic.el ("ethiopic"):
* lisp/term/tvi970.el (tvi970-set-keypad-mode):
Omit unnecessary quotes.
* lisp/faces.el (set-face-attribute, set-face-underline)
(set-face-inverse-video, x-create-frame-with-faces):
* lisp/gnus/gnus-group.el (gnus-group-nnimap-edit-acl):
* lisp/mail/supercite.el (sc-attribs-%@-addresses)
(sc-attribs-!-addresses, sc-attribs-<>-addresses):
* lisp/net/tramp.el (tramp-methods):
* lisp/recentf.el (recentf-show-file-shortcuts-flag):
* lisp/textmodes/artist.el (artist-ellipse-right-char)
(artist-ellipse-left-char, artist-vaporize-fuzziness)
(artist-spray-chars, artist-mode, artist-replace-string)
(artist-put-pixel, artist-text-see-thru):
* lisp/vc/ediff-util.el (ediff-submit-report):
* lisp/vc/log-edit.el (log-edit-changelog-full-paragraphs):
Use double-quotes rather than TeX markup in doc strings.
* lisp/skeleton.el (skeleton-pair-insert-maybe):
Reword to avoid the need for grave accent and apostrophe.
* lisp/xt-mouse.el (xterm-mouse-tracking-enable-sequence):
Don't use grave and acute accents to quote.