Fix minor issues in audio-related tutorials

tutorials/audio/audio_buses.rst

@@ -46,7 +46,7 @@ avoids infinite routing loops.
 In the above image, the output of *Bus 2* has been routed to the *Master* bus.
 
 Playback of audio through a bus
---------------------------
+-------------------------------
 
 To test passing audio to a bus, create an AudioStreamPlayer node, load an AudioStream and select a target bus for playback:
 

tutorials/audio/audio_streams.rst

@@ -40,8 +40,7 @@ AudioStreamPlayer2D
 
 This is a variant of AudioStreamPlayer, but emits sound in a 2D positional environment. When close to the left of the screen, the panning will go left. When close to the right side, it will go right.
 
-.. note:: Area2Ds can be used to divert sound from any AudioStreamPlayer2Ds they contain to specific buses. This makes it possible to create buses with different
-reverb or sound qualities to handle action happening in a particular parts of your game world.
+.. note:: Area2Ds can be used to divert sound from any AudioStreamPlayer2Ds they contain to specific buses. This makes it possible to create buses with different reverb or sound qualities to handle action happening in a particular parts of your game world.
 
 .. image:: img/audio_stream_2d_area.png