added method documentation

src/main/java/eu/dnetlib/repo/manager/service/security/AuthorizationService.java

@@ -51,9 +51,19 @@ public interface AuthorizationService {
     boolean removeAdmin(String id, String email) throws ResourceNotFoundException;
 
 
+    /**
+     * Returns the roles of the authenticated user.
+     * 
+     * @return
+     */
     Collection<String> getUserRoles();
 
-
+    /**
+     * Returns the roles of the user with the given email.
+     *
+     * @param email
+     * @return
+     */
     Collection<String> getUserRoles(String email);
 
 }