[Web Bug] - Uninstall Crossplane

The `kubectl delete provider` command does not work properly,
we should rather use `kubectl delete providers` command

I even created a PR but I am facing issues while signing off the commit, kindly help regarding that as well, thank you.
PR link : [https://github.com/crossplane/docs/pull/860](https://github.com/crossplane/docs/pull/860)

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

`kubectl delete provider`

`kubectl delete providers`

URL: https://docs.crossplane.io/latest/software/uninstall/