fixes to docs

docs/projects/inchworm/code.md

@@ -7,7 +7,7 @@ Add code to make the inchworm move.
 
 ### ~
 
-## Duration: ~15 minutes
+## Duration: ~30 minutes
 
 ## Step 2: walk forever
 
@@ -21,6 +21,7 @@ input.onButtonPressed(Button.A, () => {
     pins.servoWritePin(AnalogPin.P0, 180)
     basic.pause(500)
 });
+```
 
 ### ~ hint
 

docs/projects/inchworm/servo.md

@@ -27,7 +27,7 @@ If you are running a class or activity, you should consider preparing all servos
 ### ~ hint
 
 Kitronik wrote an excellent in-depth guide about using servos with the @boardname@. 
-Check it out at 
+Check it out at https://www.kitronik.co.uk/blog/using-bbc-microbit-control-servo/ .
 
 ### ~