sample-apiserver: stand-alone server; fix minor typos

[jot-hub]

What type of PR is this?

/kind documentation

Hi,
I spent several hours before I got the sample-apiserver's stand-alone setup to work.
I hope these minor corrections helps someone.
Thanks!

What this PR does / why we need it:

Related issue: kubernetes/sample-apiserver#7 but not necessarily a fix.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

"NONE"

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jot-hub
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[fedebongio]

/assign @roycaihw
/triage accepted
/cc @deads2k since it mentions authorization and authentication

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/assign @roycaihw
/triage accepted
/cc @deads2k since it mentions authorization and authentication

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/lifecycle rotten

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@k8s-triage-robot: Closed this PR.

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