clippy warnings; extend url_for example in user guide

src/middleware/csrf.rs

@@ -131,6 +131,7 @@ fn origin(headers: &HeaderMap) -> Option<Result<Cow<str>, CsrfError>> {
 ///            .allowed_origin("https://www.example.com"));
 /// # }
 /// ```
+#[derive(Default)]
 pub struct CsrfFilter {
     origins: HashSet<String>,
     allow_xhr: bool,

src/middleware/session.rs

@@ -276,8 +276,8 @@ impl CookieSessionInner {
 
     fn new(key: &[u8], security: CookieSecurity) -> CookieSessionInner {
         CookieSessionInner {
+            security,
             key: Key::from_master(key),
-            security: security,
             name: "actix-session".to_owned(),
             path: "/".to_owned(),
             domain: None,