Fix typos in docs/tasks.md

[chechiachang]

Changes

Fix some typos in docs/tasks.md.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
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• Includes tests (if functionality changed/added)
• [v] Includes docs (if user facing)
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[tekton-robot]

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[tekton-robot]

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[tekton-robot]

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[jlpettersson]

/ok-to-test

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[tekton-robot]

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[jlpettersson]

Thank you!

/lgtm

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[jlpettersson]

/kind documentation

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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