Update articles/application-gateway/whats-new.md

Co-Authored-By: Vic <[email protected]>

Author: winthrop28

articles/application-gateway/whats-new.md

@@ -22,7 +22,7 @@ Azure Application Gateway is updated on an ongoing basis. To stay up-to-date wit
 
 |Feature  |Description  |Date added  |
 |---------|---------|---------|
-|WAF Custom Rules |Applicaiton Gateway WAF_v2 now supports creating custom rules. See [Application Gateway custom rules](custom-waf-rules-overview.md). |June 2019 |
+|WAF custom rules |Applicaiton Gateway WAF_v2 now supports creating custom rules. See [Application Gateway custom rules](custom-waf-rules-overview.md). |June 2019 |
 |Autoscaling, zone redundancy, static VIP support GA |General availability for v2 SKU which supports autoscaling, zone redundancy, enhance performance, static VIPs, Key Vault, Header rewrite. See [Application Gateway autoscaling documentation](application-gateway-autoscaling-zone-redundant.md). |April 2019 |
 |Key Vault integration |Application Gateway now supports integration with Key Vault (in public preview) for server certificates that are attached to HTTPS enabled listeners. See [SSL termination with Key Vault certificates](key-vault-certs.md). |April 2019 |
 |Header CRUD/Rewrites     |You can now rewrite HTTP headers. See [Tutorial: Create an application gateway and rewrite HTTP headers](tutorial-http-header-rewrite-powershell.md) for more information.|December 2018|