docs(cli): tweak the cli help message for --cache-clean

src/cli/get-cli-opts.coffee

@@ -28,7 +28,7 @@ module.exports = (config) ->
 	program
 		.version config.build.pkg.version
 		.option '-s, --skip-options [opts]', 'skip build option(s) ex: dev,prod', list, []
-		.option '--cache-clean [value]', "cleans #{config.build.pkg.name}'s internal cache for an app, optionally provide * to clean internal cache for all apps"
+		.option '--cache-clean [opt]', "cleans #{config.build.pkg.name}'s internal cache for an app, optionally provide * to clean internal cache for all apps"
 		.option '--quick-start [location]', 'creates a simple application structure with a couple files. optional location: client or server. defaults to both'
 		.parse process.argv