emacs: update quoting in docstrings

The complicated looking escapes are needed to avoid compile time
warnings.  (info "(elisp) Text Quoting Style") for details.

emacs/notmuch-hello.el

@@ -145,7 +145,7 @@ a plist. Supported properties are
                    or nil. Nil means use the default sort order.
   :search-type     Specify whether to run the search in search-mode,
                    tree mode or unthreaded mode. Set to `tree' to
-                   specify tree mode, 'unthreaded to specify
+                   specify tree mode, \\='unthreaded to specify
                    unthreaded mode, and set to nil (or anything
                    except tree and unthreaded) to specify search
                    mode.

emacs/notmuch-lib.el

@@ -414,9 +414,9 @@ This is similar to `describe-function' for the current major
 mode, but bindings tables are shown with documentation strings
 rather than command names.  By default, this uses the first line
 of each command's documentation string.  A command can override
-this by setting the 'notmuch-doc property of its command symbol.
+this by setting the \\='notmuch-doc property of its command symbol.
 A command that supports a prefix argument can explicitly document
-its prefixed behavior by setting the 'notmuch-prefix-doc property
+its prefixed behavior by setting the \\='notmuch-prefix-doc property
 of its command symbol."
   (interactive)
   (let ((doc (substitute-command-keys
@@ -726,7 +726,7 @@ single element face list."
     (list face)))
 
 (defun notmuch-apply-face (object face &optional below start end)
-  "Combine FACE into the 'face text property of OBJECT between START and END.
+  "Combine FACE into the \\='face text property of OBJECT between START and END.
 
 This function combines FACE with any existing faces between START
 and END in OBJECT.  Attributes specified by FACE take precedence

emacs/notmuch-parser.el

@@ -35,7 +35,7 @@ complete S-expression from the input.  However, it extends this
 with an additional function that requires the next value in the
 input to be a list and descends into it, allowing its elements to
 be read one at a time or further descended into.  Both functions
-can return 'retry to indicate that not enough input is available.
+can return \\='retry to indicate that not enough input is available.
 
 The parser always consumes input from point in the current
 buffer.  Hence, the caller is allowed to delete any data before
@@ -52,10 +52,10 @@ point and may resynchronize after an error by moving point."
 (defun notmuch-sexp-read (sp)
   "Consume and return the value at point in the current buffer.
 
-Returns 'retry if there is insufficient input to parse a complete
+Returns \\='retry if there is insufficient input to parse a complete
 value (though it may still move point over whitespace).  If the
 parser is currently inside a list and the next token ends the
-list, this moves point just past the terminator and returns 'end.
+list, this moves point just past the terminator and returns \\='end.
 Otherwise, this moves point to just past the end of the value and
 returns the value."
   (skip-chars-forward " \n\r\t")
@@ -125,7 +125,7 @@ returns the value."
 (defun notmuch-sexp-begin-list (sp)
   "Parse the beginning of a list value and enter the list.
 
-Returns 'retry if there is insufficient input to parse the
+Returns \\='retry if there is insufficient input to parse the
 beginning of the list.  If this is able to parse the beginning of
 a list, it moves point past the token that opens the list and
 returns t.  Later calls to `notmuch-sexp-read' will return the

emacs/notmuch-print.el

@@ -41,11 +41,11 @@
 ;;; Utility functions
 
 (defun notmuch-print-run-evince (file)
-  "View FILE using 'evince'."
+  "View FILE using `evince'."
   (start-process "evince" nil "evince" file))
 
 (defun notmuch-print-run-muttprint (&optional output)
-  "Pass the contents of the current buffer to 'muttprint'.
+  "Pass the contents of the current buffer to `muttprint'.
 
 Optional OUTPUT allows passing a list of flags to muttprint."
   (apply #'notmuch--call-process-region (point-min) (point-max)

emacs/notmuch-tag.el

@@ -159,7 +159,7 @@ place of the tag.
 For example, to replace a tag with another string, simply use
 that string as a formatting expression.  To change the foreground
 of a tag to red, use the expression
-  (propertize tag 'face '(:foreground \"red\"))
+  (propertize tag \\='face \\='(:foreground \"red\"))
 
 See also `notmuch-tag-format-image', which can help replace tags
 with images."
@@ -191,7 +191,7 @@ By default this shows deleted tags with strike-through in red,
 unless strike-through is not available (e.g., emacs is running in
 a terminal) in which case it uses inverse video. To hide deleted
 tags completely set this to
-  '((\".*\" nil))
+  \\='((\".*\" nil))
 
 See `notmuch-tag-formats' for full documentation."
   :group 'notmuch-show
@@ -366,9 +366,9 @@ changed (the normal case) are shown using formats from
 (defcustom notmuch-before-tag-hook nil
   "Hooks that are run before tags of a message are modified.
 
-'tag-changes' will contain the tags that are about to be added or removed as
+`tag-changes' will contain the tags that are about to be added or removed as
 a list of strings of the form \"+TAG\" or \"-TAG\".
-'query' will be a string containing the search query that determines
+`query' will be a string containing the search query that determines
 the messages that are about to be tagged."
   :type 'hook
   :options '(notmuch-hl-line-mode)
@@ -377,9 +377,9 @@ the messages that are about to be tagged."
 (defcustom notmuch-after-tag-hook nil
   "Hooks that are run after tags of a message are modified.
 
-'tag-changes' will contain the tags that were added or removed as
+`tag-changes' will contain the tags that were added or removed as
 a list of strings of the form \"+TAG\" or \"-TAG\".
-'query' will be a string containing the search query that determines
+`query' will be a string containing the search query that determines
 the messages that were tagged."
   :type 'hook
   :options '(notmuch-hl-line-mode)

emacs/notmuch-wash.el

@@ -381,7 +381,7 @@ original filename the sender had."
 	  (notmuch-wash-subject-to-filename subject 52)))
 
 (defun notmuch-wash-convert-inline-patch-to-part (msg depth)
-  "Convert an inline patch into a fake 'text/x-diff' attachment.
+  "Convert an inline patch into a fake `text/x-diff' attachment.
 
 Given that this function guesses whether a buffer includes a
 patch and then guesses the extent of the patch, there is scope