The kernel documentation is now restructured text. Convert the IP
aliasing documentation and include it in the toplevel kernel
documentation.

 - Fix heading adornments.
 - Correctly indent code snippets.
 - Limit line length to 72 characters inline with kernel documentation
   standards.
 - Add license identifier.
Signed-off-by: NTobin C. Harding <me@tobin.cc>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>