Backport commit a0854f939 from Emacs

; Fix typos in doc strings
a0854f939ce3a1de2c8cbc5e38b106a8df4480f6
Mattias Engdegård
Fri Mar 12 12:12:14 2021 +0100

lisp/ol.el

@@ -591,7 +591,7 @@ handle this as a special case.
 
 When the function does handle the link, it must return a non-nil value.
 If it decides that it is not responsible for this link, it must return
-nil to indicate that that Org can continue with other options like
+nil to indicate that Org can continue with other options like
 exact and fuzzy text search.")
 
 

lisp/org-tempo.el

@@ -65,7 +65,7 @@ just like `org-structure-template-alist'.  The tempo snippet
 \"<KEY\" will be expanded using the KEYWORD value.  For example
 \"<L\" at the beginning of a line is expanded to \"#+latex:\".
 
-Do not use \"I\" as a KEY, as it it reserved for expanding
+Do not use \"I\" as a KEY, as it is reserved for expanding
 \"#+include\"."
   :group 'org-tempo
   :type '(repeat (cons (string :tag "Key")

lisp/org.el

@@ -20318,7 +20318,7 @@ unless optional argument NO-INHERITANCE is non-nil."
 
 (defun org-point-at-end-of-empty-headline ()
   "If point is at the end of an empty headline, return t, else nil.
-If the heading only contains a TODO keyword, it is still still considered
+If the heading only contains a TODO keyword, it is still considered
 empty."
   (let ((case-fold-search nil))
     (and (looking-at "[ \t]*$")