[3.9] bpo-43215: Document Happy Eyeballs args of asyncio.open_connect…

…ion (GH-24525) (GH-31868)

Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>.
(cherry picked from commit 3543ddb)

Co-authored-by: Illia Volochii <illia.volochii@gmail.com>

Doc/library/asyncio-stream.rst

@@ -51,7 +51,8 @@ and work with streams:
 .. coroutinefunction:: open_connection(host=None, port=None, *, \
                           loop=None, limit=None, ssl=None, family=0, \
                           proto=0, flags=0, sock=None, local_addr=None, \
-                          server_hostname=None, ssl_handshake_timeout=None)
+                          server_hostname=None, ssl_handshake_timeout=None, \
+                          happy_eyeballs_delay=None, interleave=None)
 
    Establish a network connection and return a pair of
    ``(reader, writer)`` objects.
@@ -73,6 +74,10 @@ and work with streams:
 
       The *ssl_handshake_timeout* parameter.
 
+   .. versionadded:: 3.8
+
+      Added *happy_eyeballs_delay* and *interleave* parameters.
+
 .. coroutinefunction:: start_server(client_connected_cb, host=None, \
                           port=None, *, loop=None, limit=None, \
                           family=socket.AF_UNSPEC, \