Add note about exceptions in connect.

Author: dom96

index.bs

@@ -206,6 +206,11 @@ The `connect` method performs the following steps:
   <li>The instance's {{ReadableStream}} and {{WritableStream}} streams can be used immediately.</li>
 </ol>
 
+At any point during the creation of the {{Socket}} instance, `connect` may throw an exception. One
+case where this can happen is if the input address is incorrectly formatted.
+Errors which occur asynchronously- after the socket instance has been returned- must reject the
+socket's `closed` promise.
+
 <div class="note">
   The implementation may consider blocking connections to certain hostname/port combinations which can
   pose a threat of abuse or security vulnerability.
@@ -215,6 +220,8 @@ The `connect` method performs the following steps:
 </div>
 
 
+
+
 `SocketOptions` dictionary
 ---------------------------