Improve readability of vsync and settings update code

src/tabcontrollers/AudioTabController.cpp

@@ -168,6 +168,19 @@ void AudioTabController::eventLoopTick()
     {
         return;
     }
+
+    // 89 was chosen because it's a prime number (to reduce overlap of
+    // simultaneous settings updates).
+    // Actual rate of updates is 89 * vsync (~11ms)
+    // Values chosen based on update speed priority
+    // Values in other tabs are as follows (avoid using same values):
+    // AccessibiltyTabController: 151
+    // ChaperoneTabController: 101
+    // MoveCenterTabController: 149
+    // ReviveTabController: 139
+    // SettingsTabController: 157
+    // SteamVRTabController: 97
+    // UtilitiesTabController: 19
     if ( settingsUpdateCounter >= 89 )
     {
         if ( m_micProximitySensorCanMute )