Fix typo

lisp/org.el

@@ -9957,7 +9957,7 @@ This function can be used in a hook."
     )
   "Structure completion elements.
 This is a list of abbreviation keys and values.  The value gets inserted
-if you type < followed by the key and then press the completion key,
+if you type `<' followed by the key and then press the completion key,
 usually `M-TAB'.  %file will be replaced by a file name after prompting
 for the file using completion.
 There are two templates for each key, the first uses the original Org syntax,