docs: Fix commands for IPSec key rotations
docs: Fix commands for IPSec key rotations

The commands to perform key rotations don't work because of YAML's
indentations. The key keys can be indented:

    $ ks get secrets cilium-ipsec-keys -o yaml | grep -C1 keys:
    data:
      keys: MSByZmM0MTA2KGdjbShhZXMpKSA0NDQzNDI0MTM0MzMzMjMxMjQyMzIyMjExNDEzMTIxMWY0ZjNmMmYxIDEyOA==
    kind: Secret

This commit fixes the regular expression.

Fixes: 458c623 ("Documentation: fix key rotation command in encryption guide")
Signed-off-by: Paul Chaignon <a027184a55211cd23e3f3094f1fdc728df5e0500@cilium.io>

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