sample: add ENABLE_BREAKOUT_ROOMS to env.example

env.example

@@ -70,6 +70,9 @@ TZ=UTC
 # Enable noisy mic detection
 #ENABLE_NOISY_MIC_DETECTION=1
 
+# Enable breakout rooms
+#ENABLE_BREAKOUT_ROOMS=1
+
 #
 # Let's Encrypt configuration
 #