Addressing feedback from bzbarsky-apple@

src/app/server/AppDelegate.h

@@ -39,14 +39,17 @@ class AppDelegate
     virtual void OnCommissioningSessionStarted() {}
 
     /**
-     * This is called when there is an error in establishing a commissioning session (such as, when an invalid passcode is provided)
+     * This is called when the PASE establishment failed (such as, when an invalid passcode is provided) or PASE was established
+     * fine but then the fail-safe expired (including being expired by the commissioner)
      *
      * @param err CHIP_ERROR indicating the error that occurred during session establishment
      */
     virtual void OnCommissioningSessionEstablishmentError(CHIP_ERROR err) {}
 
     /**
-     * This is called when the commissioning session establishment stops
+     * This is called when the PASE establishment failed or PASE was established fine but then the fail-safe expired (including
+     * being expired by the commissioner) AND the commissioning window is closed. The window may be closed because the commissioning
+     * attempts limit was reached or advertising/listening for PASE failed.
      */
     virtual void OnCommissioningSessionStopped() {}