Fix some typo in init-containers.md

[ydFu]

Uniform case in init-containers.md (Kubelet → kubelet)

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[sftim]

We'd often write “the kubelet” rather than just “kubelet” for phrases like these. Anyway, this fix is a small useful piece of tidying.

/kind cleanup
/lgtm
/approve

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LGTM label has been added.

Git tree hash: 885aa501697a2a332f84393a8279271b8a57b121

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