Reduce the use of @boardname@ (#527)

* Reduce the use of @boardname@

* Use literal 'EV3 Brick' string instead

* Use the new 'nickname' form

docs/reference/motors/stop-all.md

@@ -10,7 +10,7 @@ The motors stops but any motion caused from previously running the motors contin
 
 ## Example
 
-Tank the @boardname@ forward at half speed for 5 seconds and then stop.
+Tank the EV3 Brick forward at half speed for 5 seconds and then stop.
 
 ```blocks
 motors.largeAB.tank(50, 50);