Backport commit dfc2ef1 from Emacs master branch

Fix minor quoting problems in doc strings
dfc2ef11a84d33eab916ff87b8537f8e28c05c92
Paul Eggert
Thu May 28 00:22:03 2015 -0700

lisp/ob-core.el

@@ -2586,7 +2586,7 @@ block but are passed literally to the \"example-block\"."
 (defun org-babel-read (cell &optional inhibit-lisp-eval)
   "Convert the string value of CELL to a number if appropriate.
 Otherwise if cell looks like lisp (meaning it starts with a
-\"(\", \"'\", \"`\" or a \"[\") then read it as lisp,
+\"(\", \"'\", \"\\=`\" or a \"[\") then read it as lisp,
 otherwise return it unmodified as a string.  Optional argument
 NO-LISP-EVAL inhibits lisp evaluation for situations in which is
 it not appropriate."

lisp/org-agenda.el

@@ -5713,7 +5713,7 @@ This function is invoked if `org-agenda-todo-ignore-deadlines',
    (let ((calendar-date-style 'european)	(european-calendar-style t))
      (diary-date day month year mark))))
 
-;; Define the` org-class' function
+;; Define the `org-class' function
 (defun org-class (y1 m1 d1 y2 m2 d2 dayname &rest skip-weeks)
   "Entry applies if date is between dates on DAYNAME, but skips SKIP-WEEKS.
 DAYNAME is a number between 0 (Sunday) and 6 (Saturday).