Update some USAGE files.

railties/lib/generators/rails/controller/USAGE

@@ -5,9 +5,8 @@ Description:
     To create a controller within a module, specify the controller name as a
     path like 'parent_module/controller_name'.
 
-    This generates a controller class in app/controllers, view templates in
-    app/views/controller_name and then invokes the helper generator, the
-    current template engine and finally the test framework.
+    This generates a controller class in app/controllers and invokes helper,
+    template engine and test framework generators.
 
 Example:
     `./script/generate controller CreditCard open debit credit close`
@@ -18,13 +17,3 @@ Example:
         Views:           app/views/credit_card/debit.html.erb [...]
         Helper:          app/helpers/credit_card_helper.rb
         Helper Test:     test/unit/helpers/credit_card_helper_test.rb
-
-Modules Example:
-    `./script/generate controller 'admin/credit_card' suspend late_fee`
-
-    Credit card admin controller with URLs /admin/credit_card/suspend.
-        Controller:      app/controllers/admin/credit_card_controller.rb
-        Functional Test: test/functional/admin/credit_card_controller_test.rb
-        Views:           app/views/admin/credit_card/debit.html.erb [...]
-        Helper:          app/helpers/admin/credit_card_helper.rb
-        Helper Test:     test/unit/helpers/admin/credit_card_helper_test.rb

railties/lib/generators/rails/helper/USAGE

@@ -1,12 +1,12 @@
 Description:
-    Stubs out a new helper. Pass the helper name, either
-    CamelCased or under_scored.
+    Stubs out a new helper. Pass the helper name, either CamelCased
+    or under_scored.
 
     To create a helper within a module, specify the helper name as a
     path like 'parent_module/helper_name'.
 
-    This generates a helper class in app/helpers and invokes your test
-    framework.
+    This generates a helper class in app/helpers and invokes the configured
+    test framework.
 
 Example:
     `./script/generate helper CreditCard`
@@ -15,10 +15,3 @@ Example:
         Helper:     app/helpers/credit_card_helper.rb
         Test:       test/unit/helpers/credit_card_helper_test.rb
 
-Modules Example:
-    `./script/generate helper 'admin/credit_card'`
-
-    Credit card admin helper.
-        Helper:     app/helpers/admin/credit_card_helper.rb
-        Test:       test/unit/helpers/admin/credit_card_helper_test.rb
-

railties/lib/generators/rails/integration_test/USAGE

@@ -1,7 +1,9 @@
 Description:
     Stubs out a new integration test. Pass the name of the test, either
-    CamelCased or under_scored, as an argument. The new test class is
-    generated in test/integration/testname_test.rb
+    CamelCased or under_scored, as an argument.
+
+    This generator invokes the current integration tool, which defaults to
+    TestUnit.
 
 Example:
     `./script/generate integration_test GeneralStories` creates a GeneralStories

railties/lib/generators/rails/mailer/USAGE

@@ -2,8 +2,8 @@ Description:
     Stubs out a new mailer and its views. Pass the mailer name, either
     CamelCased or under_scored, and an optional list of emails as arguments.
 
-    This generates a mailer class in app/models, view templates in
-    app/views/mailer_name and then invokes your test framework.
+    This generates a mailer class in app/models and invokes your template
+    engine and test framework generators.
 
 Example:
     `./script/generate mailer Notifications signup forgot_password invoice`

railties/lib/generators/rails/observer/USAGE

@@ -2,8 +2,8 @@ Description:
     Stubs out a new observer. Pass the observer name, either CamelCased or
     under_scored, as an argument.
 
-    The generator creates an observer class in app/models and a unit test in
-    the configured test framework.
+    The generator creates an observer class in app/models and invokes the
+    configured test framework.
 
 Example:
     `./script/generate observer Account`

railties/lib/generators/rails/performance_test/USAGE

@@ -1,7 +1,9 @@
 Description:
     Stubs out a new performance test. Pass the name of the test, either
-    CamelCased or under_scored, as an argument. The new test class is
-    generated in test/performance/testname_test.rb
+    CamelCased or under_scored, as an argument.
+
+    This generator invokes the current performance tool, which defaults to
+    TestUnit.
 
 Example:
     `./script/generate performance_test GeneralStories` creates a GeneralStories