revise implementation-notes.md for #179

doc/implementation-notes.md

@@ -296,9 +296,13 @@ Keyboard navigation is implemented. Look for these "markers" to identify related
   pressing the keyboard button in the navigation bar.
 * If all else fails, search for `// pdom`, which generally appears before code that is specific to a11y.
 
-User-interface sounds are implemented, and most of the sounds are provided by common-code UI components. There are 
-2 exceptions to user-interface sounds: (1) As of this writing, the amplitude sliders in the **Discrete** screen have temporary sound support (see [AudibleSlider.js](https://github.com/phetsims/fourier-making-waves/blob/master/js/common/view/AudibleSlider.js)).
-Other sliders in the sim do not support sound, due to lack of support in Slider.js.
-(2) Measurement Tools do not currently have associated sounds, as discussed in https://github.com/phetsims/fourier-making-waves/issues/169.
+User-interface sounds are implemented, and most of the sounds are provided by common-code UI components. There are 2
+exceptions to user-interface sounds: (1) As of this writing, the amplitude sliders in the **Discrete** and
+**Wave Game** screens have temporary sound support
+(
+see [AmplitudeSlider.js](https://github.com/phetsims/fourier-making-waves/blob/master/js/common/view/AmplitudeSlider.js))
+. Other sliders in the sim do not support sound, due to lack of support in Slider.js.
+(2) Measurement Tools do not currently have associated sounds, as discussed
+in https://github.com/phetsims/fourier-making-waves/issues/169.
 
 Voicing and screen reader support are not implemented as of this writing.