Update examples in docs for changes in apiVersion v1

[johankok]

Changes

• Updated example in pipelineruns.md with taskRef
• Updated example in workspaces.md for casing of workspaces.configMap

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
• pre-commit Passed
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Release Notes

NONE

[johankok]

/kind documentation

[pramodbindal]

/ok-to-test

[waveywaves]

/retest

[waveywaves]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vdemeester, waveywaves

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[waveywaves]

/retest

[vdemeester]

/retest

[waveywaves]

/retest

[johankok]

/retest

[waveywaves]

/retest

[waveywaves]

@vdemeester is going to force merge PR as these tests are not going to run and this is a veryu small docs change