📖 Add Metal3 to list for beta release notification (kubernetes-sigs#8980)

* add metal-3 to list of CAPI providers

* Fix typo in list

Co-authored-by: killianmuldoon <[email protected]>

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Co-authored-by: Vince Prignano <[email protected]>
Co-authored-by: killianmuldoon <[email protected]>

Author: 3 people

docs/release/release-tasks.md

@@ -399,6 +399,7 @@ We should inform at least the following providers via a new issue on their respe
  - Kubemark: https://github.com/kubernetes-sigs/cluster-api-provider-kubemark/issues/new
  - Kubevirt: https://github.com/kubernetes-sigs/cluster-api-provider-kubevirt/issues/new
  - IBMCloud: https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/issues/new
+ - Metal3: https://github.com/metal3-io/cluster-api-provider-metal3/issues/new
  - Nested: https://github.com/kubernetes-sigs/cluster-api-provider-nested/issues/new
  - OCI: https://github.com/oracle/cluster-api-provider-oci/issues/new
  - Openstack: https://github.com/kubernetes-sigs/cluster-api-provider-openstack/issues/new