Backport commit cc857dd from Emacs master branch

Fix misspellings like "an unibyte buffer"
cc857dd0db0fad257747134bdbd8318a21d12cab
Paul Eggert
Tue Dec 9 16:27:23 2014 -0800

lisp/org.el

@@ -20358,7 +20358,7 @@ This command does many different things, depending on context:
 	  (item
 	   ;; At an item: a double C-u set checkbox to "[-]"
 	   ;; unconditionally, whereas a single one will toggle its
-	   ;; presence.  Without an universal argument, if the item
+	   ;; presence.  Without a universal argument, if the item
 	   ;; has a checkbox, toggle it.  Otherwise repair the list.
 	   (let* ((box (org-element-property :checkbox context))
 		  (struct (org-element-property :structure context))

lisp/ox-ascii.el

@@ -185,7 +185,7 @@ original Org buffer at the same place."
   :package-version '(Org . "8.0")
   :type '(choice
 	  (const :tag "Replicate original spacing" nil)
-	  (cons :tag "Set an uniform spacing"
+	  (cons :tag "Set a uniform spacing"
 		(integer :tag "Number of blank lines before contents")
 		(integer :tag "Number of blank lines after contents"))))