Use section headers for shared types

docs/reference-security-get_service_credentials.asciidoc

@@ -45,9 +45,9 @@ Get service account credentials.
 
 [source,ts]
 ----
-interface SecurityGetServiceCredentialsRequest extends <<shared-type-request-base, RequestBase>> {
-  namespace: <<shared-type-namespace, Namespace>>
-  service: <<shared-type-name, Name>>
+interface SecurityGetServiceCredentialsRequest extends <<RequestBase>> {
+  namespace: <<Namespace>>
+  service: <<Name>>
 }
 ----
 
@@ -58,8 +58,8 @@ interface SecurityGetServiceCredentialsRequest extends <<shared-type-request-bas
 ----
 interface SecurityGetServiceCredentialsResponse {
   service_account: string
-  count: <<shared-type-integer, integer>>
-  tokens: Record<string, <<shared-type-metadata, Metadata>>>
+  count: <<integer>>
+  tokens: Record<string, <<Metadata>>>
   nodes_credentials: SecurityGetServiceCredentialsNodesCredentials
 }
 ----