policy: Add l4filter l7rules generation comment
policy: Add l4filter l7rules generation comment

Describe that the L4filter L7Rules are not the strict representation
that is passed to the proxy; Additional computation may result in
allowing all at L7.

Manually tested to verify the results at runtime.

Signed-off-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@covalent.io>

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