CI: remove path filter in docs workflow
CI: remove path filter in docs workflow

This prevents us from marking this job as blocking in GitHub,
as having an optional jobs a blocking one also makes little
sense.

Signed-off-by: Ilya Dmitrichenko <59b6733e47280dc0842a1e64fb2a9c742d686e46@gmail.com>

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