Add :experimental:, fix a warning

modules/ROOT/pages/about.adoc

@@ -1,3 +1,4 @@
+:experimental:
 = About the team
 
 In 2017 the Fedora Engineering team merged with the CentOS Engineering team

modules/ROOT/pages/sle_services.adoc

@@ -1,13 +1,16 @@
+:experimental:
+:toc:
 = Services SLE
 
 Here is the list of our services per SLE level. For memory these levels are
 presented in our xref:sle.adoc[SLE Documentation].
 
-
-WARNING: This document is still a **work in progress**. The services listed
+[WARNING]
+====
+This document is still a **work in progress**. The services listed
 there are at their appropriate level for Fedora but not all of them are under
 the responsabilities of the CPE team which is currently not represented here.
-
+====
 
 == Critical