Fix PULL_REQUEST_TEMPLATE.md

[suning0]

fix the url path of [versioning]、[documentation]、[DCO] error

Note on DCO:

If the DCO action in the integration test fails, one or more of your commits are not signed off. Please click on the Details link next to the DCO action for instructions on how to resolve this.

Checklist:

• [ ] I have bumped the chart version according to versioning
• [ ] I have updated the documentation according to documentation
• [ ] Any new values are backwards compatible and/or have sensible default.
• [ ] I have signed off all my commits as required by DCO.

Changes are automatically published when merged to main. They are not published on branches.

[clusterpedia-bot]

Hi @suning0, Thanks for your pull request! If the PR is ready, use the /auto-cc command to assign Reviewer to Review. We will review it shortly.

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