docs/library/network.rst: Simplify socket import.

Replace `import socket as socket` with `import socket`.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

docs/library/network.rst

@@ -27,7 +27,7 @@ For example::
     print(nic.ifconfig())
 
     # now use socket as usual
-    import socket as socket
+    import socket
     addr = socket.getaddrinfo('micropython.org', 80)[0][-1]
     s = socket.socket()
     s.connect(addr)