Merge pull request #8758 from amatsuda/plugin_new_error_message

Misleading error message that prompts non-existing command [ci skip]

railties/lib/rails/generators/rails/plugin_new/plugin_new_generator.rb

@@ -175,7 +175,7 @@ class PluginNewGenerator < AppBase # :nodoc:
                                                  "skip adding entry to Gemfile"
 
       def initialize(*args)
-        raise Error, "Options should be given after the plugin name. For details run: rails plugin --help" if args[0].blank?
+        raise Error, "Options should be given after the plugin name. For details run: rails plugin new --help" if args[0].blank?
 
         @dummy_path = nil
         super