📖 update links to godoc.org to use pkg.go.dev

[xrstf]

Links to godoc.org seem to unconditionally and permanently redirect to pkg.go.dev nowadays:

$ curl -I https://godoc.org/github.com/go-logr/logr
HTTP/2 301
date: Mon, 27 Dec 2021 18:53:05 GMT
content-type: text/html; charset=utf-8
location: https://pkg.go.dev/github.com/go-logr/logr?utm_source=godoc
x-cloud-trace-context: 22d12027c3a1e74c4ccb40ccfc47d4cb/10602237531594422575;o=1
via: 1.1 google

This PR therefore changes the links to pkg.go.dev. I also noticed one typo and then looked and found a couple of other places where it's and its were mixed up.

[k8s-ci-robot]

Hi @xrstf. Thanks for your PR.

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[FillZpp]

/ok-to-test
/lgtm

[xrstf]

/assign @pwittrock

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, xrstf

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