Correct section on CSS minification

Author: kategengler

guides/advanced-use/asset-compilation.md

@@ -108,8 +108,8 @@ module.exports = function(defaults) {
 
 ## Minifying
 
-Compiled css-files are minified by `broccoli-clean-css` or `broccoli-csso`,
-if it is installed locally. You can pass minifer-specific options to them using
+Compiled css-files are minified by `ember-cli-clean-css`, or other registered css minifiers,
+if they are installed locally. You can pass minifer-specific options to them using
 the `minifyCSS:options` object in your ember-cli-build. Minification is enabled by
 default in the production-env and can be disabled using the `minifyCSS:enabled`
 switch.