2.1.28, initiation update to PXT v5.28.24 (#54)

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

@@ -3,21 +3,23 @@
 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)
 ```
 
-### Parameters
+## ~ hint
 
-* ``bpm`` is a [number](/reference/types/number) that says how much to
+**Simulator**: This function only works on the @boardname@ and in some browsers.
+
+## ~
+
+## Parameters
+
+* ``bpm`` is a [number](/types/number) that says how much to
   change the bpm (beats per minute, or number of beats in a minute of
   the music that the @boardname@ is playing).
 
-### Examples
+## Examples
 
 This program makes the music faster by 12 bpm.
 
@@ -31,7 +33,7 @@ This program makes the music _slower_ by 12 bpm.
 music.changeTempoBy(-12)
 ```
 
-### See also
+## See also
 
 [play tone](/reference/music/play-tone), [ring tone](/reference/music/ring-tone)