Add docstrings for volume functions

src/libexec/saturnin-iam

 }
 
 i_am_deaf() {
+    #
+    # so turn volume up
+    #
     amixer -q sset Master 5%+
 }
 
 i_am_deafnomore() {
+    #
+    # so turn volume back down
+    #
     amixer -q sset Master 5%-
 }
 
 }
 
 i_am_listening() {
+    #
+    # to the real world or to the box
+    #
     if sound_is_muted;
     then
         amixer -q sset Master unmute;