docs: Remove incorrect beta note for host policies
docs: Remove incorrect beta note for host policies

Fixes: d56f0ae8 ("docs: Mark host firewall stable")
Reported-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@cilium.io>
Signed-off-by: Paul Chaignon <a027184a55211cd23e3f3094f1fdc728df5e0500@cilium.io>

michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium