docs: Improve L4-L7 (+HTTP) policy section
docs: Improve L4-L7 (+HTTP) policy section

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

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