Remove help text about interactive-mode problems.

This is fixed now, so the warning is no longer needed.

ido-ubiquitous.el

@@ -138,12 +138,7 @@ continue to use `completing-read' instead of
 
 Only *interactive* commands should go here. To disable
 ido-ubiquitous in non-interactive functions, customize
-`ido-ubiquitous-function-exceptions'.
-
-Note: this feature depends on the variable `this-command' being
-properly set to the name of the currently executing command.
-Depending on how the command is onvoked, this may or may not
-happen, so this feature may simply not work in some cases."
+`ido-ubiquitous-function-exceptions'."
   ;; This isn't actually a hook, but it is a list of functions, so
   ;; that's close enough.
   :type 'hook