update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/application-dev/reference/apis/js-apis-useriam-userauth.md

@@ -179,7 +179,7 @@ try {
                 case userIAM_userAuth.FaceTips.FACE_AUTH_TIP_TOO_BRIGHT:
                 // Do something;
                 case userIAM_userAuth.FaceTips.FACE_AUTH_TIP_TOO_DARK:
-                // Do something;
+                // Do something.
                 default:
                 // Do others.
             }