Add examples in docs for JoinHandle.

src/libstd/thread/mod.rs

@@ -614,6 +614,30 @@ impl<T> JoinInner<T> {
 /// This `struct` is created by the [`thread::spawn`] function and the
 /// [`thread::Builder::spawn`] method.
 ///
+/// # Examples
+///
+/// Creation from [`thread::spawn`]:
+///
+/// ```rust
+/// use std::thread;
+///
+/// let join_handle: thread::JoinHandle<_> = thread::spawn(|| {
+///     // some work here
+/// });
+/// ```
+///
+/// Creation from [`thread::Builder::spawn`]:
+///
+/// ```rust
+/// use std::thread;
+///
+/// let builder = thread::Builder::new();
+///
+/// let join_handle: thread::JoinHandle<_> = builder.spawn(|| {
+///     // some work here
+/// }).unwrap();
+/// ```
+///
 /// [`thread::spawn`]: fn.spawn.html
 /// [`thread::Builder::spawn`]: struct.Builder.html#method.spawn
 #[stable(feature = "rust1", since = "1.0.0")]