docs: update doc on limits for kubeproxy-free
docs: update doc on limits for kubeproxy-free

Now that support for IPv4 fragments has been merged, remove the note in
kubeproxy-free documentation telling that fragments are dropped.

Reported-by: da39a3ee5e6b4b0d3255bfef95601890afd80709@pchaigno
Signed-off-by: Quentin Monnet <d6b8e48afb2534b213e391cab43016505747a234@isovalent.com>

michi-covalent/cilium,cilium-team/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,cilium-team/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium