Fix Pull Request resource example url.

[tejal29]

The Pull request url in the docs points to an invalid url.

Changes

Fix the url to point to a valid url.

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Release Notes

[tekton-robot]

Hi @tejal29. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dibyom]

/ok-to-test
/approve
/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom, tejal29

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[dibyom]

/test pull-tekton-pipeline-build-tests