Escape ` and ' in doc

Escape apostrophes and grave accents in docstrings if they are
are supposed to stand for themselves and are not quotes.  Remove
apostrophes from docstring examples like ‘'(calendar-nth-named-day
-1 0 10 year)’ that confuse source code with data.  Do some other
minor docstring fixups as well, e.g., insert a missing close
quote.

lisp/emacs-lisp/cl.el

@@ -568,7 +568,7 @@ may be bound to temporary variables which are introduced
 automatically to preserve proper execution order of the arguments.
 For example:
 
-  (defsetf nth (n x) (v) `(setcar (nthcdr ,n ,x) ,v))
+  (defsetf nth (n x) (v) \\=`(setcar (nthcdr ,n ,x) ,v))
 
 You can replace this form with `gv-define-setter'.
 

lisp/emacs-lisp/eieio.el

@@ -683,12 +683,12 @@ This class is not stored in the `parent' slot of a class vector."
   "Make a new instance of CLASS based on INITARGS.
 For example:
 
-  (make-instance 'foo)
+  (make-instance \\='foo)
 
 INITARGS is a property list with keywords based on the `:initarg'
 for each slot.  For example:
 
-  (make-instance 'foo :slot1 value1 :slotN valueN)")
+  (make-instance \\='foo :slot1 value1 :slotN valueN)")
 
 (define-obsolete-function-alias 'constructor #'make-instance "25.1")
 

lisp/emacs-lisp/eldoc.el

@@ -337,8 +337,8 @@ and the face `eldoc-highlight-function-argument', if they are to have any
 effect.
 
 Major modes should modify this variable using `add-function', for example:
-  (add-function :before-until (local 'eldoc-documentation-function)
-                #'foo-mode-eldoc-function)
+  (add-function :before-until (local \\='eldoc-documentation-function)
+                #\\='foo-mode-eldoc-function)
 so that the global documentation function (i.e. the default value of the
 variable) is taken into account if the major mode specific function does not
 return any documentation.")

lisp/emacs-lisp/gv.el

@@ -218,7 +218,7 @@ return a Lisp form that does the assignment.
 The first arg in ARGLIST (the one that receives VAL) receives an expression
 which can do arbitrary things, whereas the other arguments are all guaranteed
 to be pure and copyable.  Example use:
-  (gv-define-setter aref (v a i) `(aset ,a ,i ,v))"
+  (gv-define-setter aref (v a i) \\=`(aset ,a ,i ,v))"
   (declare (indent 2) (debug (&define name sexp body)))
   `(gv-define-expander ,name
      (lambda (do &rest args)