Add documentation for into_shared

src/types/entities/mod.rs

@@ -124,6 +124,12 @@ pub trait Composite<T: Updateable + Clone + Debug> {
         vec
     }
 
+    /// Uses [`Shared`] to provide an ergonomic alternative to `Arc::new(RwLock::new(obj))`.
+    ///
+    /// [`Shared<Self>`] can then be observed using the [`Gateway`], turning the underlying
+    /// `dyn Composite<Self>` into a self-updating struct, which is a tracked variant of a chorus
+    /// entity struct, updating its' held information when new information concerning itself arrives
+    /// over the [`Gateway`] connection, reducing the need for expensive network-API calls.
     fn into_shared(self) -> Shared<Self>
     where
         Self: Sized,