docs(guides): resort and add minor update

src/content/guides/production.md

@@ -1,6 +1,6 @@
 ---
 title: Production
-sort: 7
+sort: 8
 contributors:
   - henriquea
   - rajagopal4890

src/content/guides/tree-shaking.md

@@ -1,6 +1,6 @@
 ---
 title: Tree Shaking
-sort: 8
+sort: 7
 contributors:
   - simon04
   - zacanger
@@ -54,6 +54,8 @@ export function cube(x) {
 
 With that in place, let's update our entry script to utilize this one of these new methods:
 
+__src/index.js__
+
 ``` diff
   import _ from 'lodash';
 + import { cube } from './math.js';