docs/crd: Fix CRD schema compat duplicate version
docs/crd: Fix CRD schema compat duplicate version

We now support multiple versions for CRD schemas so this check was
duplicating the CRD versions incorrectly in the table:

    $ git grep -o 'CustomResourceDefinitionSchemaVersion =.*' \
        upstream/v1.10 -- pkg/k8s
    upstream/v1.10:pkg/k8s/apis/cilium.io/v2/register.go:
        CustomResourceDefinitionSchemaVersion = "1.23.1"
    upstream/v1.10:pkg/k8s/apis/cilium.io/v2alpha1/register.go:
        CustomResourceDefinitionSchemaVersion = "1.23.1"

Add a 'uniq' here so we at least don't mess up the table for these
legitimate cases for now. I don't think we have immediate plans to
support different schema versions for the different resource versions.

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

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