Update README.md

README.md

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 ## (Optional) Step 4: Additional configurations
-<details><summary>Expand for configurations</detail>
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+<details><summary>Expand for configurations</summary>
 
 ### Adding passthrough metrics
 By default, this package will select `clicks`, `impressions`, and `cost` from the source reporting tables to store into the staging models. If you would like to pass through additional metrics to the staging models, add the below configurations to your `dbt_project.yml` file. These variables allow for the pass-through fields to be aliased (`alias`) if desired, but not required. Use the below format for declaring the respective pass-through variables: