Minor docs tweaks

Author: tomchristie

docs/topics/3.0-announcement.md

@@ -32,7 +32,7 @@ Significant new functionality continues to be planned for the 3.1 and 3.2 releas
 
 #### REST framework: Under the hood.
 
-This talk from the Django: Under the Hood event in Amsterdam, Nov 2014 gives some good background context on the design decisions behind 3.0.
+This talk from the [Django: Under the Hood](http://www.djangounderthehood.com/) event in Amsterdam, Nov 2014, gives some good background context on the design decisions behind 3.0.
 
 <iframe width="560" height="315" src="//www.youtube.com/embed/3cSsbe-tA0E" frameborder="0" allowfullscreen></iframe>