Update update-api-object-kubectl-patch.md

[praveen-kg]

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[praveen-kg]

This PR is related to the documentation error in Update API Objects in Place Using kubectl patch.
https://kubernetes.io/docs/tasks/run-application/update-api-object-kubectl-patch/
The example command kubectl patch deployment patch-demo --patch "$(cat patch-file.yaml)" provided in document referrers to patch-file.yaml, it should patch-file.json as just before this example says create patch-file.json file and has json syntax.
If we execute kubectl patch deployment patch-demo --patch "$(cat patch-file.yaml)" will throw error, it should be kubectl patch deployment patch-demo --patch "$(cat patch-file.json)"

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[makoscafee]

Hi @praveen-kg care to sign CLA for these changes to be merged?

[xiangpengzhao]

@praveen-kg good catch! Thanks for the contribution! Please sign your CLA before we can merge this change as @makoscafee mentioned :)

[praveen-kg]

I have signed the CLA

[makoscafee]

/LGTM
/approve

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