Update the description of the webpack runtime chunk

Author: stof

lib/plugins/commons-chunks.js

@@ -29,8 +29,8 @@ module.exports = function(plugins, webpackConfig) {
             name: [
                 webpackConfig.sharedCommonsEntryName,
                 /*
-                * Always dump a 2nd file - manifest.json that
-                * will contain the webpack manifest information.
+                * Always dump a 2nd file - manifest.js that
+                * will contain the webpack runtime.
                 * This changes frequently, and without this line,
                 * it would be packaged inside the "shared commons entry"
                 * file - e.g. vendor.js, which would prevent long-term caching.