Document how to override DNS resolution.

Ref #1343.

docs/faq/client.rst

@@ -48,6 +48,16 @@ In the :mod:`threading` API, this argument is named ``additional_headers``::
     with connect(..., additional_headers={"Authorization": ...}) as websocket:
         ...
 
+How do I force the IP address that the client connects to?
+----------------------------------------------------------
+
+Use the ``host`` argument of :meth:`~asyncio.loop.create_connection`::
+
+    await websockets.connect("ws://example.com", host="192.168.0.1")
+
+:func:`~client.connect` accepts the same arguments as
+:meth:`~asyncio.loop.create_connection`.
+
 How do I close a connection?
 ----------------------------
 

docs/faq/server.rst

@@ -252,10 +252,12 @@ It's available in :attr:`~legacy.protocol.WebSocketCommonProtocol.remote_address
     async def handler(websocket):
         remote_ip = websocket.remote_address[0]
 
-How do I set the IP addresses my server listens on?
----------------------------------------------------
+How do I set the IP addresses that my server listens on?
+--------------------------------------------------------
 
-Look at the ``host`` argument of :meth:`~asyncio.loop.create_server`.
+Use the ``host`` argument of :meth:`~asyncio.loop.create_server`::
+
+    await websockets.serve(handler, host="192.168.0.1", port=8080)
 
 :func:`~server.serve` accepts the same arguments as
 :meth:`~asyncio.loop.create_server`.