Update source/chapters/preferences/sound_hardware.rst

Co-authored-by: ronso0 <ronso0@mixxx.org>

Author: daschuer

source/chapters/preferences/sound_hardware.rst

@@ -220,7 +220,7 @@ Outputs
   loopback device for video recordings etc.
 
 * **Left Bus / Center Bus / Right Bus**: All decks, samplers, and auxiliaries
-  routed to the respective side of the :term:`crossfader`. The busses are picked
+  routed to the respective side of the :term:`crossfader`. The buses are picked
   post-fader and post-effects and can be used with an external two channel mixer.
 
 * **Deck 1-4**: Separate outputs for each of the main decks. They are picked