Fix grammar in description of org-refile-targets

lisp/org.el

@@ -1421,8 +1421,8 @@ This is list of cons cells.  Each cell contains:
   a file name or a list of file names.  If you use `org-agenda-files' for
   that, all agenda files will be scanned for targets.  Nil means, consider
   headings in the current buffer.
-- A specification of how to select find candidate refile targets.  This
-  may be any of
+- A specification of how to find candidate refile targets.  This may be
+  any of:
   - a cons cell (:tag . \"TAG\") to identify refile targets by a tag.
     This tag has to be present in all target headlines, inheritance will
     not be considered.