Documentation: Add missing fields to net_cachelines

Documentation: Add missing fields to net_cachelines

Two fields, page_pools and *irq_moder, were added to struct net_device
in commit 083772c9f972 ("net: page_pool: record pools per netdev") and
commit f750dfe825b9 ("ethtool: provide customized dim profile
management"), respectively.

Add both to the net_cachelines documentation, as well.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20240829155742.366584-1-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>