Fix a few typos and clean up hooks section

[orangejulius]

The hooks section in the cluster spec documentation had a few typos and other rough spots. This should make it read a little more smoothly.

[k8s-ci-robot]

Hi @orangejulius. Thanks for your PR.

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[chrislovecnm]

You mind signing the CLA? Cncf requires it, sorry for any hassle

[orangejulius]

Yes of course. Sorry about that, it was actually a bit of a tricky process to go through especially because I didn't initially use the same email as on my Github account. Should be fixed in a few minutes! 🎉

[chrislovecnm]

/ok-to-test
/lgtm

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This pull-request has been approved by: chrislovecnm

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[k8s-github-robot]

Automatic merge from submit-queue. .