Format workspaces description and correct unclear words

[donglinjy]

Changes

Format Workspaces markdown and correct unclear words.

/kind documentation

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[tekton-robot]

Hi @donglinjy. Thanks for your PR.

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[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbwsg

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[ghost]

/ok-to-test

[jerop]

/lgtm

[ghost]

/test pull-tekton-pipeline-unit-tests

/test pull-tekton-pipeline-build-tests

[ghost]

/test pull-tekton-pipeline-unit-tests

[vdemeester]

/test all