Example overrides for 'music' api docs (#353)

* Example overrides for 'music' api docs

* Drop 'music' into card page

docs/reference.md

@@ -1,6 +1,7 @@
 # Reference
 
 ```namespaces
+music.playSoundEffect(sounds.animalsCatPurr);
 sensors.color(null);
 motors.stopAll();
 brick.showMood(moods.sleeping);
@@ -18,5 +19,6 @@ control.runInParallel(function(){});
 [brick](/reference/brick),
 [sensors](/reference/sensors),
 [motors](/reference/motors),
+[music](/reference/music),
 [control](/reference/control),
 [console](/reference/console)

docs/reference/music/ring-tone.md

@@ -0,0 +1,11 @@
+# @extends
+
+## Example #example
+
+This program checks the speed from the large `A` motor and uses the speed to adjust a tone it rings.
+
+```blocks
+loops.forever(function () {
+    music.ringTone(motors.largeA.speed() * 100)
+})
+```

docs/reference/music/set-volume.md

@@ -0,0 +1,10 @@
+# @extends
+
+## Example #example
+
+Play a tyrannosaurus roar at half volume.
+
+```blocks
+music.setVolume(50)
+music.playSoundEffect(sounds.animalsTRexRoar)
+```

docs/reference/music/stop-all-sounds.md

@@ -0,0 +1,10 @@
+# @extends
+
+## Example #example
+
+Play a sound effect but stop it right away.
+
+```blocks
+music.playSoundEffect(sounds.expressionsCrying)
+music.stopAllSounds()
+```