Documentation: Add missing fields to net_cachelines

Two fields, page_pools and *irq_moder, were added to struct net_device
in commit 083772c ("net: page_pool: record pools per netdev") and
commit f750dfe ("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>

Documentation/networking/net_cachelines/net_device.rst

@@ -176,3 +176,5 @@ netdevice_tracker                   dev_registered_tracker
 struct_rtnl_hw_stats64*             offload_xstats_l3                                               
 struct_devlink_port*                devlink_port                                                    
 struct_dpll_pin*                    dpll_pin                                                        
+struct hlist_head                   page_pools
+struct dim_irq_moder*               irq_moder