Document optional BigQuery Location field

[lisaah]

What does this PR do? What is the motivation?

Documents the new optional Location field in the BigQuery warehouse connection settings for Datadog Experiments, added in https://github.com/ddoghq/dd-source/pull/78991.

Customers whose BigQuery dataset lives in a non-default region need a way to tell Datadog where to submit experiment queries. This adds that field to the existing setup steps.

Changes:

• Added a Location (optional) bullet to the Dataset and GCS Bucket field list in the BigQuery branch of ## Step 3: Configure experiment settings in hugo/content/en/experiments/guide/connecting_a_data_warehouse.mdoc.md.
• The entry explains what to enter (the location of the dataset created in Step 1, for example europe-west2), that Datadog submits experiment queries in that location, and that leaving it blank lets BigQuery infer the location.

Testing:

• Verified the new bullet matches the surrounding field-list format, including the page's existing Field (optional): convention used by the Copy IAM role ARN field in the Redshift branch, and the [Step 1](#create-a-bigquery-dataset) anchor already used by the sibling Dataset field.
• Checked the copy against the substitution and temporal-word tables in CLAUDE.md (no ensure, via, just, will, currently, and so on). Vale is not installed in this environment, so this check was manual.
• Confirmed the change is scoped to the BigQuery {% if equals($database, "bigquery") %} block and does not affect the Databricks, Redshift, or Snowflake branches.
• Left the screenshot alt text unchanged, since the existing image does not show the new field.

Merge readiness

• Ready for merge

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AI assistance

Drafted with Bits Code, then reviewed against the page's existing field-list conventions and the repo style guide.

Additional notes

The field label is documented as Location, matching the short labels used by the sibling Dataset and GCS Bucket fields. Please confirm this matches the label shipped in the UI.

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Modified Files

• https://docs-staging.datadoghq.com/dd/lisa.huynh/bigquery-experiment-location-field/experiments/guide/connecting_a_data_warehouse