Fix the rails new -A description

The -A description in the CLI was "Indicates when to generate skip asset pipeline". After this change it's "Skip the asset pipeline setup", which mimics all existing "skip ..." descriptions.

Author: codergeek121

railties/lib/rails/generators/app_base.rb

@@ -71,7 +71,8 @@ def self.add_shared_options_for(name)
         class_option :skip_action_cable,   type: :boolean, aliases: "-C", default: nil,
                                            desc: "Skip Action Cable files"
 
-        class_option :skip_asset_pipeline, type: :boolean, aliases: "-A", default: nil
+        class_option :skip_asset_pipeline, type: :boolean, aliases: "-A", default: nil,
+                                           desc: "Skip the asset pipeline setup"
 
         class_option :skip_javascript,     type: :boolean, aliases: ["-J", "--skip-js"], default: (true if name == "plugin"),
                                            desc: "Skip JavaScript files"