Add doc markers to code

Summary: Referencing these from the wiki should be better than copy-pasting so we know they are up-to-date

Reviewed By: passy

Differential Revision: D23564251

fbshipit-source-id: ad90fcaa88c3c638212a277ce49a5faa41cd07df

website/docusaurus.config.js

@@ -7,7 +7,9 @@
  * @format
  */
 
+// start-import-example
 const {fbContent, fbInternalOnly} = require('internaldocs-fb-helpers');
+// end-import-example
 
 const repoUrl = 'https://github.com/facebook/flipper';
 const siteConfig = {
@@ -48,13 +50,15 @@ const siteConfig = {
           label: 'GitHub',
           position: 'right',
         },
+        // start-internal-navbar-example
         ...fbInternalOnly([
           {
             to: 'docs/fb/index',
             label: 'FB Internal',
             position: 'right',
           },
         ]),
+        // end-internal-navbar-example
       ],
     },
     colorMode: {

website/sidebars.js

@@ -63,6 +63,7 @@ module.exports = {
       'tutorial/js-custom',
       'tutorial/js-publishing',
     ],
+    // start-internal-sidebars-example
     'Plugin Development': [
       'extending/js-setup',
       'extending/js-plugin-api',
@@ -83,6 +84,7 @@ module.exports = {
         'extending/fb/sandy/flipper-plugin',
       ]),
     ],
+    // end-internal-sidebars-example
     'Other Platforms': [
       'extending/new-clients',
       'extending/establishing-a-connection',