Update modules/ROOT/pages/authentication-authorization/immutable-roles-privileges.adoc

Co-authored-by: Phil Wright <[email protected]>

Author: renetapopova

modules/ROOT/pages/authentication-authorization/immutable-roles-privileges.adoc

@@ -125,6 +125,6 @@ REVOKE MATCH {*} ON GRAPH * ELEMENTS * FROM analyst
 [NOTE]
 ====
 Only immutable privileges (e.g. `GRANT IMMUTABLE MATCH {*} ON GRAPH * ELEMENTS * TO analyst` in the example above) can be assigned to immutable roles.
-This is to make sure that the role and all of its privileges is explicitly and completely immutable.
+This is to make sure that an immutable role and all of its privileges is explicitly and completely immutable.
 ====