docs: Use getaddrinfo() result in easy way.

Instead of extracting 4th element, extact last. Much easier to remember!

docs/library/usocket.rst

@@ -49,7 +49,7 @@ Functions
    The following example shows how to connect to a given url::
 
       s = socket.socket()
-      s.connect(socket.getaddrinfo('www.micropython.org', 80)[0][4])
+      s.connect(socket.getaddrinfo('www.micropython.org', 80)[0][-1])
 
 .. only:: port_wipy
 

docs/library/ussl.rst

@@ -21,7 +21,7 @@ Functions
       import ssl
       s = socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_SEC)
       ss = ssl.wrap_socket(s)
-      ss.connect(socket.getaddrinfo('www.google.com', 443)[0][4])
+      ss.connect(socket.getaddrinfo('www.google.com', 443)[0][-1])
 
    Certificates must be used in order to validate the other side of the connection, and also to
    authenticate ourselves with the other end. Such certificates must be stored as files using the
@@ -44,7 +44,7 @@ Functions
       import ssl
       s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_SEC)
       ss = ssl.wrap_socket(s, cert_reqs=ssl.CERT_REQUIRED, ca_certs='/flash/cert/ca.pem')
-      ss.connect(socket.getaddrinfo('cloud.blynk.cc', 8441)[0][4])
+      ss.connect(socket.getaddrinfo('cloud.blynk.cc', 8441)[0][-1])
 
    SSL sockets inherit all methods and from the standard sockets, see the :mod:`usocket` module.