rename enhanced sound -> extra sound, phetsims/tambo#165

documentation/qa-book.md

@@ -1285,7 +1285,7 @@ what is important and interactive on the screen.
 - Verify that sound is produced for all the major actions that occur in a sim.  This is unavoidably vague, since sims have so much variation, but the basic idea is to make sure that something major wasn't missed or is malfunctioning in the implementation of the sound design.
 - Verify that none of the sounds produced are disproportionately loud compared to the others, i.e. the balance is good.  Note that the sound designers often use the Reset All button's sound as the volume reference.
 - Play all sounds on multiple platforms and verify that there are no crackles, glitches, or anything that seems broken or significantly different on one platform versus the others.
-- If the simulation supports "Enhanced Sound", test with it on and off and verify that the enhanced sounds play when this is on and don't when it is off.  You may need to consult the sound design document or ask the developer to figure out which sounds are in the "Enhanced" category.
+- If the simulation supports "Extra Sound", test with it on and off and verify that the extra sounds play when this is on and don't when it is off.  You may need to consult the sound design document or ask the developer to figure out which sounds are in the "Extra" category.
 - The sound design has gone through numerous iterations by the time it is in testing, so the sound design team is past the point of soliciting general feedback, but if a QA tester encounters something with the sound design that truly strikes them as misleading, frustrating, distracting, or otherwise problematic, it is okay to log an issue.
 
 ##### *Additional Notes about Sound:*