docs: boot-devices: Document Boston as containing i40

stewart > What's the intel nic in boston?
     jk > i40

Except we aren't supposed to call it Boston, so put p9dsu in the table.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/doc/boot-devices.rst b/doc/boot-devices.rst
index d4db9eb..5886b08 100644
--- a/doc/boot-devices.rst
+++ b/doc/boot-devices.rst
@@ -39,7 +39,7 @@
 +-------------------------------+-----------------------+--------+----------------------------+
 | Intel 10GbE PCIe              | IXGBE                 |        |                            |
 +-------------------------------+-----------------------+--------+----------------------------+
-| Intel XL710 Ethernet          | I40E                  |        |                            |
+| Intel XL710 Ethernet          | I40E                  | P9DSU  | jk@ozlabs.org              |
 +-------------------------------+-----------------------+--------+----------------------------+
 | Mellanox 1/10/40Gbit Ethernet | MLX4_EN               |        |                            |
 +-------------------------------+-----------------------+--------+----------------------------+