rotuing pref works with prefix, remove limitation

Author: brianlehr

articles/virtual-network/ip-services/routing-preference-overview.md

@@ -65,7 +65,7 @@ The price difference between both options is reflected in the internet egress da
 ## Limitations
 
 * Internet routing preference is only compatible with zone-redundant standard SKU of public IP address. Basic SKU of public IP address is not supported.
-* Internet routing preference currently supports only IPv4 public IP addresses. IPv6 public IP addresses are not supported.
+* Internet routing preference currently supports only IPv4 public IP addresses. IPv6 public IP addresses aren't supported.
 
 ### Regional Unavailability
 Internet routing preference is available in all regions except: