Update README.md

Author: matheuscscp

rfcs/0010-multi-tenant-workload-identity/README.md

@@ -50,7 +50,7 @@ Flux currently supports basically two modes of authentication:
   the cloud provider Go libraries used by the Flux controllers when they
   are running inside the respective cloud environment. The problem with
   this approach is that it is single-tenant, i.e. all objects are reconciled
-  using the same cloud identity, associated with the respective controller.
+  using the same cloud identity, the one associated with the respective controller.
 
 For delivering the high level of security and multi-tenancy support that
 Flux aims for, it is necessary to extend the workload identity support to