Update metricflow-time-spine.md

[aerielsoriano]

Updated the WHERE clause for the BigQuery Daily code block. It throws an error when using the original suggestion.

What are you changing in this pull request and why?

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."
• The content in this PR requires a dbt release note, so I added one to the release notes page.

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• https://docs-getdbt-com-git-aerielsoriano-patch-1-dbt-labs.vercel.app/docs/build/metricflow-time-spine

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[matthewshaver]

Thank you @aerielsoriano !!