docs: fix typo on flag for running on net-next
docs: fix typo on flag for running on net-next

Typo in documentation: "ci/next-next". Fix to "ci/net-next".

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

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