fix: typo in leases.md

[dkarczmarski]

fix typo in leases.md

when i execute the following command, there is no "kube-" in "kube-apiserver-sha256-hash"

myuser@workstation0:~$ kubectl -n kube-system get lease -l apiserver.kubernetes.io/identity=kube-apiserver
NAME                                   HOLDER                                                                      AGE
apiserver-c7uylvfxlbqccnk6myfkwetzze   apiserver-c7uylvfxlbqccnk6myfkwetzze_1c2230d2-4137-4a1c-88ee-1a23655c0fb7   8h

[linux-foundation-easycla]

• ✅login: dkarczmarski / (5381a2e)

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[stmcginnis]

Confirmed the corrected name is what is actually used.

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 29604e76f9f21ccaa5b28b73dd5acd0c22251be8

[dipesh-rawat]

/approve

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