Fix message in controllers generator

Closes #5814

Signed-off-by: Carlos Antonio da Silva <[email protected]>

Author: nkroker

lib/generators/devise/controllers_generator.rb

@@ -11,7 +11,7 @@ class ControllersGenerator < Rails::Generators::Base
         Create inherited Devise controllers in your app/controllers folder.
 
         Use -c to specify which controller you want to overwrite.
-        If you do no specify a controller, all controllers will be created.
+        If you do not specify a controller, all controllers will be created.
         For example:
 
           rails generate devise:controllers users -c=sessions