Pass doc coverage tests

Author: Sam Phippen

lib/rspec/rails/example/system_example_group.rb

@@ -3,7 +3,7 @@
   module RSpec
     module Rails
       # @api public
-      # Container class for request spec functionality.
+      # Container class for system tests
       module SystemExampleGroup
         extend ActiveSupport::Concern
         include RSpec::Rails::RailsExampleGroup
@@ -15,6 +15,7 @@ module SystemExampleGroup
 
         include ActionDispatch::IntegrationTest::Behavior
 
+        # @api private
         module BlowAwayAfterTeardownHook
           def after_teardown
           end