Use the same create-plugin tutorial for FB and non-FB users

Summary: Per title

Reviewed By: passy

Differential Revision: D25558871

fbshipit-source-id: 85fbc73143a5ca172115169d08f8cdce502eb833

docs/tutorial/android.mdx

@@ -3,6 +3,7 @@ id: android
 title: Building an Android Plugin
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
+import {FbInternalOnly} from 'internaldocs-fb-helpers';
 
 <img alt="Android Tutorial App" src={useBaseUrl("img/android-tutorial-app.png")} />
 
@@ -22,6 +23,12 @@ https://github.com/facebook/flipper/tree/7dae5771d96ea76b75796d3b3a2c78746e581e3
 
 ## Creating a Plugin
 
+<FbInternalOnly>
+<div class="warning">
+[FB-Only] Depending the options selected during scaffolding (see intro), some of the following code might already have been generated by `scarf`. 
+</div>
+</FbInternalOnly>
+
 On Android, a Flipper plugin is a class that implements the
 [`FlipperPlugin`](https://github.com/facebook/flipper/blob/master/android/src/main/java/com/facebook/flipper/core/FlipperPlugin.java)
 interface.