maintainers: add switch doc to ethdev section
maintainers: add switch doc to ethdev section

This patch adds file to "Ethernet API" section of MAINTAINERS file:
F: doc/guides/prog_guide/switch_representation.rst

Signed-off-by: Dekel Peled <f1921780d3213ef78965aec36396441d9bf8894c@mellanox.com>
Acked-by: Thomas Monjalon <5f50a84c1fa3bcff146405017f36aec1a10a9e38@monjalon.net>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk