Update VRF unbind command (sonic-net#2331)

*Update vrf unbind command in Command-References.md

Author: KhoobBabe

doc/Command-Reference.md

@@ -4484,7 +4484,7 @@ This will move the interface to default vrf.
 
 - Usage:
   ```
-  config interface vrf unbind <interface_name> <vrf_name>
+  config interface vrf unbind <interface_name>
   ```
   
   ### Interface vrf binding show commands