chore(base-cluster/docs): mention validity of .x.x part in the versions

[cwrau]

No description provided.

[teutonet-bot]

🤖 I have diffed this beep boop

"/$namespace/$kind/$name.yaml" for normal resources
"/$namespace/HelmRelease/$name/$namespace/$kind/$name.yaml" for HelmReleases <- this is recursive
'null' means it's either cluster-scoped or it's in the default namespace for the HelmRelease

charts/base-cluster/ci/monitoring-ingress-unauthenticated-values.yaml

charts/base-cluster/ci/rbac-values.yaml has no changes

charts/base-cluster/ci/pagerduty-values.yaml

charts/base-cluster/ci/velero-backupStorageLocations-gen-values.yaml

charts/base-cluster/ci/flux-gitrepositories-gen-values.yaml

charts/base-cluster/ci/imagepullsecrets-values.yaml has no changes

charts/base-cluster/values.yaml has no changes

charts/base-cluster/ci/artifacthub-values.yaml has no changes

charts/base-cluster/ci/disabled-ingress-values.yaml

charts/base-cluster/ci/priorityclasses-values.yaml

charts/base-cluster/ci/deadmansswitch-values.yaml

charts/base-cluster/ci/monitoring-oidc-values.yaml

charts/base-cluster/ci/basic-values.yaml has no changes

charts/base-cluster/ci/monitoring-oidc-ingress-disabled-values.yaml

charts/base-cluster/ci/limitrange-resourcequota-values.yaml