Write missing documentation in iced_native

native/src/widget/id.rs

@@ -3,14 +3,19 @@ use std::sync::atomic::{self, AtomicUsize};
 
 static NEXT_ID: AtomicUsize = AtomicUsize::new(0);
 
+/// The identifier of a generic widget.
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct Id(Internal);
 
 impl Id {
+    /// Creates a custom [`Id`].
     pub fn new(id: impl Into<borrow::Cow<'static, str>>) -> Self {
         Self(Internal::Custom(id.into()))
     }
 
+    /// Creates a unique [`Id`].
+    ///
+    /// This function produces a different [`Id`] every time it is called.
     pub fn unique() -> Self {
         let id = NEXT_ID.fetch_add(1, atomic::Ordering::Relaxed);