Update of doctring about origins

Author: daH005

src/websockets/asyncio/server.py

@@ -599,7 +599,7 @@ def handler(websocket):
             See :meth:`~asyncio.loop.create_server` for details.
         port: TCP port the server listens on.
             See :meth:`~asyncio.loop.create_server` for details.
-        origins: Acceptable values of the ``Origin`` header, for defending
+        origins: Acceptable values of the ``Origin`` header, including regular expressions, for defending
             against Cross-Site WebSocket Hijacking attacks. Include :obj:`None`
             in the list if the lack of an origin is acceptable.
         extensions: List of supported extensions, in order in which they