pxt-microbit Accessibility PR (#529)

* Accessibility changes

docs/projects/milky-monster.md

@@ -1,13 +1,13 @@
 
 # Milk monster
 
-### @description A milky-monster like robot built with the @boardname@
+## @description A milky-monster like robot built with the @boardname@
 
-### ~avatar avatar
+## ~avatar avatar
 
 Make a funny milky-monster robot!
 
-### ~
+## ~
 
 https://youtu.be/egl3fNAYylk
 
@@ -17,20 +17,20 @@ https://youtu.be/egl3fNAYylk
 
 ## Materials
 
-### Recycled
+## Recycled
 
 * 1 Milk Carton (with a screwable top cap)
 * 1 Small cord - recylce string from a used tea bag 
 * 1 Paper clip
 
-### Electronics
+## Electronics
 
 * 1 @boardname@, battery holder and 2 AAA batteries
 * 3 Crocodile clips
 * 1 micro servo 9g SG90
 * 1 servo clip designed for Milky Monster [download on thingiverse](http://www.thingiverse.com/thing:2185971) (optional). Teachers may prefer to download the classroom pack (16 servo clips).
 
-### Tools
+## Tools
 
 * Small knive and  Scissors that can cut cardboard
 * Tape (masking, duct tape, and/or packing tape)
@@ -50,11 +50,11 @@ https://youtu.be/egl3fNAYylk
 * [Code](/projects/milky-monster/code)  
 * [Connect](/projects/milky-monster/connect)  
 
-### ~button /projects/milky-monster/make
+## ~button /projects/milky-monster/make
 
 Let's get started!
 
-### ~
+## ~
 
 ## about the author
 This project was contributed by Peter Heldens [@peterheldens](https://twitter.com/peterheldens). You can checkout his [@boardname@ makershow channel on youtube](http://aka.ms/microbit-makershow) for more projects.