fix some typo error

[googs1025]

fix some typo error
fix readme Installation url

[k8s-ci-robot]

Hi @googs1025. Thanks for your PR.

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[kannon92]

/ok-to-test
/lgtm

[danielvegamyhre]

Thanks for the fixes!
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danielvegamyhre, googs1025

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