Update custom-ip-address-prefix.md

fix pricing wording
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cc: @asudbring

Author: brianlehr

articles/virtual-network/ip-services/custom-ip-address-prefix.md

@@ -62,7 +62,7 @@ When ready, you can issue the command to have your range advertised from Azure a
 
 ## Pricing
 
-* There's no charge to provision or use custom IP prefixes. There's no charge for all public IP prefixes and public IP addresses that are derived from custom IP prefixes
+* There is no charge to provision or use custom IP prefixes. Similarly, there is no charge for any public IP prefixes and public IP addresses that are derived from custom IP prefixes.
 
 * All traffic destined to a custom IP prefix range is charged the [internet egress rate](https://azure.microsoft.com/pricing/details/bandwidth/). Customers traffic to a custom IP prefix address from within Azure are charged internet egress for the source region of their traffic. Egress traffic from a custom IP address prefix range is charged the equivalent rate as an Azure public IP from the same region