fix link to example go-template for release tool

[mjlshen]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

I was looking into using the release-notes tool in this repo and noticed that the documentation pointed to an example template that has since been moved.

Which issue(s) this PR fixes:

None

Does this PR introduce a user-facing change?

NONE

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[k8s-ci-robot]

Hi @mjlshen. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mjlshen, saschagrunert

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[mjlshen]

The test got rate-limited

Error:      	Expected nil, but got: &fmt.wrapError{msg:"unable to list GitHub issues for kubernetes/sig-release repo: getting issues from client: fetching issues from repo: GET https://api.github.com/repos/kubernetes/sig-release/issues?per_page=50&state=open: 403 API rate limit exceeded for 18.189.147.8. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.) [rate reset in 9m15s]", err:(*fmt.wrapError)(0xc003cd53a0)}

/test pull-release-integration-test

[k8s-ci-robot]

@mjlshen: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

The test got rate-limited

Error:      	Expected nil, but got: &fmt.wrapError{msg:"unable to list GitHub issues for kubernetes/sig-release repo: getting issues from client: fetching issues from repo: GET https://api.github.com/repos/kubernetes/sig-release/issues?per_page=50&state=open: 403 API rate limit exceeded for 18.189.147.8. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.) [rate reset in 9m15s]", err:(*fmt.wrapError)(0xc003cd53a0)}

/test pull-release-integration-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[saschagrunert]

/retest

[saschagrunert]

/ok-to-test