made another method final

svn: r18482

original commit: 3bcea5bbe03062068c929e21e7ea6b3981080c22

collects/mred/private/wxme/text.ss

@@ -656,7 +656,7 @@
 
   (def/override (locked-for-read?)
     read-locked?)
-  (def/override (locked-for-flow?)
+  (def/override-final (locked-for-flow?)
     flow-locked?)
   (def/override (locked-for-write?)
     write-locked?)

collects/scribblings/gui/editor-intf.scrbl

@@ -1184,8 +1184,7 @@ This method does not affect internal locks, as discussed in
 
 }
 
-@defmethod[(locked-for-flow?)
-           boolean?]{
+@defmethod[#:mode public-final (locked-for-flow?) boolean?]{
 
 Reports whether the editor is internally locked for flowing. See
  @|lockdiscuss| for more information.