[core] WAHA_NAMESPACE=all in example

.env.example

@@ -21,6 +21,8 @@ WHATSAPP_SWAGGER_ENABLED=True
 # ==================
 # WhatsApp engine (WEBJS is default, GOWS or NOWEB for better performance)
 WHATSAPP_DEFAULT_ENGINE=WEBJS
+# So you don't have to create sessions/apps when switching between engines
+WAHA_NAMESPACE=all
 
 # "Firefox (YourApp)" in Linked Devices
 # WAHA_CLIENT_DEVICE_NAME=YourApp