Update Microsoft.Web/certificate

Removing text that doesn't apply for Micrsoft.Web/certificates

Author: yutanglin16

articles/azure-resource-manager/management/resources-without-resource-group-limit.md

@@ -226,7 +226,7 @@ Some resources have a limit on the number instances per region. This limit is di
 ## Microsoft.Web
 
 * apiManagementAccounts/apis
-* certificates - By default, limited to 800 instances. That limit can be increased by [registering the following features](preview-features.md) - Microsoft.Web/DisableResourcesPerRGLimitForAPIMinWebApp 
+* certificates
 * sites
 
 ## Next steps