Show loop form in send() migration example

Author: SeanTAllen

.release-notes/next-release.md

@@ -52,12 +52,18 @@ end
 
 ```pony
 // Before
-let data = ssl.send()?
+while ssl.can_send() do
+  let data = ssl.send()?
+  conn.write(consume data)
+end
 
 // After
-match ssl.send()
-| let data: Array[U8] iso => // ...
-| None => // ...
+while true do
+  match ssl.send()
+  | let data: Array[U8] iso =>
+    conn.write(consume data)
+  | None => break
+  end
 end
 ```