fix uid config example

Author: MrYamous

components/uid.rst

@@ -99,7 +99,7 @@ configure the behavior of the factory using configuration files::
             uid:
                 default_uuid_version: 6
                 name_based_uuid_version: 5
-                name_based_uuid_namespace: {6ba7b810-9dad-11d1-80b4-00c04fd430c8}
+                name_based_uuid_namespace: "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}"
                 time_based_uuid_version: 6
                 time_based_uuid_node: 121212121212