Update example usage to mention forceIgnoreNoIndex [skip ci]

Author: weareoutman

README.md

@@ -55,10 +55,12 @@ module.exports = {
         // ... Your options.
         // `hashed` is recommended as long-term-cache of index file is possible.
         hashed: true,
-        // For Docs using Chinese, The `language` is recommended to set to:
-        // ```
+
+        // For Docs using Chinese, it is recomended to set:
         // language: ["en", "zh"],
-        // ```
+
+        // If you're using `noIndex: true`, set `forceIgnoreNoIndex` to enable local index:
+        // forceIgnoreNoIndex: true,
       }),
     ],
   ],