3.md - change screen shots

Need to change screen shots and then say "scroll down to" so that it matches the updated API Reference docs.

https://user-images.githubusercontent.com/4925801/34444315-44881c00-ec9b-11e7-919e-78c06ec81289.png

Author: LaurenMalhoit

labs/coding-101-rest-basics-ga/3.md

@@ -53,7 +53,7 @@ Study the Ticket API in APIC-EM:
 
     ![](/posts/files/coding-101-rest-basics-ga/assets/images/refguide1.png)
 
-* Click **Roll Based Access Control**, then click **ticket**.
+* Click **Roll Based Access Control**, then scroll down to **ticket**.
 
     ![](/posts/files/coding-101-rest-basics-ga/assets/images/refguide2.png)