Updated delete providers command

[YashxG]

The command kubectl delete provider <provider_name> gives errors, the correct command to delete provider was kubectl delete providers <provider_name> replaced provider with providers.
I have attached the relevant screenshots.

kubectl delete provider

kubectl delete providers

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[jbw976]

Thanks for taking the time to make this update @YashxG!

I wasn't able to reproduce the behavior, but I know that depending on what CRDs are installed in your cluster, kubectl can have different behavior for using kinds without their groups or without plurals, etc. so I think this change is reasonable 😂

Could you also please make this same edit to the other support version folders under the content dir? i.e. v1.17, v1.19, and master?

[jbw976]

Oh and please amend any commits you make to include the DCO sign-off. Info about that can be found in https://github.com/crossplane/crossplane/tree/main/contributing#certificate-of-origin