Update dns-alias.md

Updating the Alias per ARM resource to 50 instead of 20.

Author: jonbeck7

articles/dns/dns-alias.md

@@ -37,7 +37,7 @@ In the following example, an alias named **vm1** is added that points to the pub
 - **Point to a Standard SKU public IP resource from a DNS A/AAAA record set.** You can create an A/AAAA record set and make it an alias record set to point to a Standard SKU public IP resource. The DNS record set changes automatically if the public IP address changes or is deleted. Dangling DNS records that point to incorrect IP addresses are avoided.
 
    > [!NOTE]
-   > There's a current limit of 20 alias records sets per resource.
+   > There's a current limit of 50 alias records sets per resource.
 
 - **Point to a Traffic Manager profile from a DNS A/AAAA/CNAME record set** - You can create an A/AAAA or CNAME record set and use alias records to point it to a Traffic Manager profile. It's especially useful when you need to route traffic at a zone apex, as traditional CNAME records aren't supported for a zone apex. For example, say your Traffic Manager profile is myprofile.trafficmanager.net and your business DNS zone is contoso.com. You can create an alias record set of type A/AAAA for contoso.com (the zone apex) and point to myprofile.trafficmanager.net.
 - **Point to an Azure Content Delivery Network (CDN) endpoint** - This alias type is useful when you create static websites using Azure storage and Azure CDN.