fix code, resize images

_android/tutorial.md

@@ -12,7 +12,7 @@ This tutorial is written for readers who are new to either or both Blockstack
 and Android to create a decentralized application. It contains the following
 content:
 
-- TOC
+TOC
 {:toc}
 
 This tutorial was extensively tested using Android Studio 3.6 on a Dell XPS 13
@@ -508,7 +508,6 @@ Now that you have created your initial project and verified it running in an emu
 
    ```kotlin
    package blockstack.id.user.hello
-   ```
 
     import android.content.Intent
     import android.os.Bundle
@@ -578,7 +577,6 @@ class MainActivity : AppCompatActivity(), SignInProvider {
         }
 
     }
-
    ```
 
 ### Run the final app in the emulator
@@ -607,4 +605,3 @@ The system might prompt you how to select a browser.
 Congratulations, you've completed your Android app using the Blockstack Android SDK.
 
 Learn more about Blockstack by [trying another tutorial](https://blockstack.org/tutorials).
-```