Clarify that metrics can be used in query-level filters

[courtneyholcomb]

What are you changing in this pull request and why?

A user in the community slack expressed after reading the docs, thinking that metrics could not be used in query-level filters. Here, I added clarification explaining that they can be used there.

Checklist

• [x] Review the Content style guide so my content adheres to these guidelines.
• [x] For docs versioning, review how to version a whole page and version a block of content.
• [x] Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

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