chore: regenerate beta.6 examples + fix regen script (#5484)

* update examples script

* rename ext

* typo

* update examples

* fix script to update starters

* update examples

* add --allow-empty so that script does not fail if nothing changed

* fix lint

examples/facebook/sidebars.js

@@ -7,9 +7,29 @@
  * @format
  */
 
+/**
+ * Creating a sidebar enables you to:
+ - create an ordered group of docs
+ - render a sidebar for each doc of that group
+ - provide next/previous navigation
+
+ The sidebars can be generated from the filesystem, or explicitly defined here.
+
+ Create as many sidebars as you want.
+ */
+
 module.exports = {
-  someSidebar: {
-    Docusaurus: ['doc1', 'doc2', 'doc3'],
-    Features: ['mdx'],
-  },
+  // By default, Docusaurus generates a sidebar from the docs folder structure
+  tutorialSidebar: [{type: 'autogenerated', dirName: '.'}],
+
+  // But you can create a sidebar manually
+  /*
+  tutorialSidebar: [
+    {
+      type: 'category',
+      label: 'Tutorial',
+      items: ['hello'],
+    },
+  ],
+   */
 };