Add link to examples of good release notes to template

[dibyom]

Changes

Our community/standards.md doc has some examples for what a good release note should look like. This commit adds a link to it in our pull request template for better visibility to PR authors.

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
• Follows the commit message standard
• Meets the Tekton contributor standards (including functionality, content, code)
• Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

/kind misc

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dibyom / name: Dibyo Mukherjee (b0d75e2)

[jerop]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerop, lbernick

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