fixed typo

controller/rbac/databaseRoleStore.go

@@ -18,7 +18,7 @@ type DatabaseRoleStore struct {
 	roleStoreName string
 }
 
-// Add adda a Role.
+// Add adds a Role.
 func (s *DatabaseRoleStore) Add(roleToAdd rbac.Role) error {
 	client, ctx, cancel := database.GetMongoConnection()
 	defer cancel()