add mib commit to "enable ethernet ports" section

Author: lmepisowifi

_ont/ont-yotc-m2-2050-g40.md

@@ -256,7 +256,9 @@ diag port set phy-force-power-down port 0 state disable
 #enable lan 2
 mib set SW_PORT_TBL.1.Enable 1
 # disable lan 2 power down state
-diag port set phy-force-power-down port 1 state disable 
+diag port set phy-force-power-down port 1 state disable
+
+mib commit
 ```
 
 ## Enable WiFi