pxt-microbit Accessibility PR (#529)

* Accessibility changes

docs/projects/telegraph/make.md

@@ -1,10 +1,10 @@
 # Make
 
-### ~avatar
+## ~avatar
 
 Let's build a telegraph between two @boardname@s.
 
-### ~
+## ~
 
 ![](/static/mb/lessons/telegraph-0.png)
 
@@ -15,61 +15,61 @@ Let's build a telegraph between two @boardname@s.
 
 ## Steps
 
-### Step 1
+## Step 1
 
 ![](/static/mb/lessons/banana-keyboard-1.png)
 
 Using the 1st crocodile clip, connect the end of the crocodile clip onto GND pin on the @boardname@.
 
-### Step 2
+## Step 2
 
 ![](/static/mb/lessons/ornament-chain-2.png)
 
 Using the 2nd crocodile clip, connect the end of the crocodile clip onto the 3V pin on the @boardname@.
 
-### Step 3
+## Step 3
 
 ![](/static/mb/lessons/ornament-chain-3.png)
 
 Using the 3rd crocodile clip, connect the end of the crocodile clip onto pin 1 of the @boardname@.
 
-### Step 4
+## Step 4
 
 ![](/static/mb/lessons/ornament-chain-4.png)
 
 Using the 4th crocodile clip, connect the end of the crocodile clip onto pin 2 of the @boardname@.
 
-### Step 5
+## Step 5
 
 ![](/static/mb/lessons/ornament-chain-5.png)
 
 Using the 1st crocodile clip, connect the unattached end of the crocodile clip onto the GND on the 2nd @boardname@.
 
-### Step 6
+## Step 6
 
 ![](/static/mb/lessons/ornament-chain-6.png)
 
 Using the 2nd crocodile clip, connect the unattached end of the crocodile clip onto the 3V pin on the 2nd @boardname@.
 
-### Step 7
+## Step 7
 
 ![](/static/mb/lessons/ornament-chain-7.png)
 
 Using the 3rd crocodile clip, connect the unattached end of the crocodile clip onto pin 2 of the 2nd @boardname@.
 
-### Step 8
+## Step 8
 
 ![](/static/mb/lessons/ornament-chain-8.png)
 
 Using the 4th crocodile clip, connect the unattached end of the crocodile clip onto pin 1 of the 2nd @boardname@
 
-### Step 9
+## Step 9
 
 ![](/static/mb/lessons/telegraph-0.png)
 
 
-### ~button /projects/telegraph/code
+## ~button /projects/telegraph/code
 
 NEXT: Code
 
-### ~
+## ~