Merge pull request #986 from hlxsites/add-prereq-vcs-selfmanaged

[CAS] GitLab self-managed- add requirement

docs/en/enterprise-edition/content-collections/application-security/get-started/connect-code-and-build-providers/code-repositories/add-gitlab-selfmanaged.adoc

@@ -19,6 +19,8 @@ NOTE: Refer to <<#subscribed-events,Subscribed Events>> below for a list of subs
 .. Add the Prisma Cloud IP addresses and hostname for Application Security to an xref:../../../../get-started/console-prerequisites.adoc[allow list] to enable access to the Prisma Cloud Console. 
 .. Ensure the use of the default port 443 for the integration.
 
+.. Provide a hostname or IP address that can be resolved on the public DNS.
+
 . On the Prisma Cloud Application Security console.
 
 .. In *Application Security*, select *Home* > *Settings* > *Connect Provider* > *Code & Build Providers*.