Revert "Update USAGE docs for generators."

This reverts commit d31e03f356.

railties/lib/rails/generators/rails/controller/USAGE

@@ -13,6 +13,6 @@ Example:
 
     Credit card controller with URLs like /credit_card/debit.
         Controller:      app/controllers/credit_card_controller.rb
-        Functional Test: test/controllers/credit_card_controller_test.rb
+        Functional Test: test/functional/credit_card_controller_test.rb
         Views:           app/views/credit_card/debit.html.erb [...]
         Helper:          app/helpers/credit_card_helper.rb

railties/lib/rails/generators/rails/helper/USAGE

@@ -13,5 +13,5 @@ Example:
 
     Credit card helper.
         Helper:     app/helpers/credit_card_helper.rb
-        Test:       test/helpers/credit_card_helper_test.rb
+        Test:       test/unit/helpers/credit_card_helper_test.rb
 

railties/lib/rails/generators/rails/mailer/USAGE

@@ -11,5 +11,5 @@ Example:
     creates a Notifications mailer class, views, test, and fixtures:
         Mailer:     app/mailers/notifications.rb
         Views:      app/views/notifications/signup.erb [...]
-        Test:       test/controllers/notifications_test.rb
+        Test:       test/functional/notifications_test.rb
         Fixtures:   test/fixtures/notifications/signup [...]

railties/lib/rails/generators/rails/model/USAGE

@@ -21,7 +21,7 @@ Examples:
         For ActiveRecord and TestUnit it creates:
 
             Model:      app/models/account.rb
-            Test:       test/models/account_test.rb
+            Test:       test/unit/account_test.rb
             Fixtures:   test/fixtures/accounts.yml
             Migration:  db/migrate/XXX_add_accounts.rb
 

railties/lib/rails/generators/rails/observer/USAGE

@@ -9,4 +9,4 @@ Example:
 
     For ActiveRecord and TestUnit it creates:
         Observer:   app/models/account_observer.rb
-        TestUnit:   test/observers/account_observer_test.rb
+        TestUnit:   test/unit/account_observer_test.rb

railties/lib/rails/generators/rails/scaffold_controller/USAGE

@@ -15,6 +15,6 @@ Example:
 
     Credit card controller with URLs like /credit_card/debit.
         Controller:      app/controllers/credit_cards_controller.rb
-        Functional Test: test/controllers/credit_cards_controller_test.rb
+        Functional Test: test/functional/credit_cards_controller_test.rb
         Views:           app/views/credit_cards/index.html.erb [...]
         Helper:          app/helpers/credit_cards_helper.rb