style changes

actionmailer/lib/rails/generators/mailer/USAGE

-*Description:*
+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/mailers and invokes your template
     engine and test framework generators.
 
-*Example:*
-    -rails generate mailer Notifications signup forgot_password invoice-
+Example:
+========
+    rails generate mailer Notifications signup forgot_password invoice
 
     creates a Notifications mailer class, views, test, and fixtures:
         Mailer:     app/mailers/notifications.rb