Update apex-domain-azure-dns.md - small Acrolinx fix

Author: American-Dipper

articles/static-web-apps/apex-domain-azure-dns.md

@@ -25,7 +25,7 @@ The following procedure requires you to copy settings from an Azure DNS zone you
 
 1. Under *Settings*, select **Custom domains**.
 
-1. Select **+ Add**, and then select **Custom Domain on Azure DNS** from the drop down menu.
+1. Select **+ Add**, and then select **Custom Domain on Azure DNS** from the drop-down menu.
 
 1. Select your apex domain name from the *DNS zone* drop-down.