Update some music ref docs (#1693)

* Update some music ref docs

* bad link

* Actually add the note, hello

docs/reference/music/change-tempo-by.md

@@ -3,14 +3,16 @@
 Makes the [tempo](/reference/music/tempo) (speed of a piece of music)
 faster or slower by the amount you say.
 
-## Simulator
-
-This function only works on the @boardname@ and in some browsers.
-
 ```sig
 music.changeTempoBy(20)
 ```
 
+## ~ hint
+
+**Simulator**: This function only works on the @boardname@ and in some browsers.
+
+## ~
+
 ## Parameters
 
 * ``bpm`` is a [number](/types/number) that says how much to