Use a more direct link for the `metric` resource type

[dbeatty10]

Preview

What are you changing in this pull request and why?

During a separate PR review, @mirnawong1 noticed a more direct link for metrics.

Checklist

• [x] Review the Content style guide so my content adheres to these guidelines.

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Name	Status	Preview	Comments	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 12, 2024 2:32pm