minor rewording [skip ci]

framework/filters/AccessRule.php

@@ -42,8 +42,8 @@ class AccessRule extends Component
      * - `?`: matches a guest user (not authenticated yet)
      * - `@`: matches an authenticated user
      *
-     * Alternatively RBAC (Role-Based Access Control) premission name could be specified. In this case
-     * [[User::can()]] will be called in order to check access.
+     * If you are using RBAC (Role-Based Access Control), you may also specify role or permission names.
+     * In this case, [[User::can()]] will be called to check access.
      *
      * If this property is not set or empty, it means this rule applies to all roles.
      */