Bug #1152: use non-deprecated name in example.

Doc/library/simplexmlrpcserver.rst

@@ -162,7 +162,7 @@ server::
 
    import xmlrpclib
 
-   s = xmlrpclib.Server('http://localhost:8000')
+   s = xmlrpclib.ServerProxy('http://localhost:8000')
    print s.pow(2,3)  # Returns 2**3 = 8
    print s.add(2,3)  # Returns 5
    print s.div(5,2)  # Returns 5//2 = 2