Update garbage-collection.md for misleading "ImageMaximumGCAge" configuration option

[chillje]

The documentation about the feature gate and option field "ImageMaximumGCAge" is misleading. The option field for the kubelet configuration is camelCase and needs to start with a lowercase "i" instead of an uppercase "I" (like for the feature gate option).

[linux-foundation-easycla]

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[dipesh-rawat]

@chillje Thanks you for your contribution.
Could you please sign the CLA before the PR can be reviewed.
You can follow the steps documented here: https://git.k8s.io/community/CLA.md

[dipesh-rawat]

/easycla

[dipesh-rawat]

Thanks!

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 3ce282a10847f41ca65a96071c0a8736a9f043cb

[tengqm]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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