take builtin role into account in docs tests

Author: martijnvg

x-pack/docs/en/rest-api/security/get-builtin-privileges.asciidoc

@@ -63,6 +63,7 @@ A successful call returns an object with "cluster" and "index" fields.
     "manage_api_key",
     "manage_ccr",
     "manage_data_frame_transforms",
+    "manage_enrich",
     "manage_ilm",
     "manage_index_templates",
     "manage_ingest_pipelines",