Fix documentation

src/audio/sound_world.h

@@ -32,7 +32,7 @@ public:
 	/// After this call, the instance will be destroyed.
 	virtual void stop(SoundInstanceId id) = 0;
 
-	/// Returns wheter the sound @a id is playing.
+	/// Returns whether the sound @a id is playing.
 	virtual bool is_playing(SoundInstanceId id) = 0;
 
 	/// Stops all the sounds in the world.

src/input/input_device.h

@@ -35,7 +35,7 @@ struct InputDevice
 	/// Returns whether the specified @a b button is released in the current frame.
 	bool released(uint8_t i) const;
 
-	/// Returns wheter any button is pressed in the current frame.
+	/// Returns whether any button is pressed in the current frame.
 	bool any_pressed() const;
 
 	/// Returns whether any button is released in the current frame.