Replace 'Vertex AI For Firebase' usage with 'Vertex AI in Firebase'

[dlarocque]

Replace 'Vertex AI For Firebase' usage with 'Vertex AI in Firebase'.

[changeset-bot]

⚠️ No Changeset found

Latest commit: f48c9dc

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (c6a8851) and merge commit (ccbff16).

Test Logs

• Base (c6a8851): https://github.com/firebase/firebase-js-sdk/actions/runs/10509900088
• Merge (ccbff16): https://github.com/firebase/firebase-js-sdk/actions/runs/10515311572

1. https://storage.googleapis.com/firebase-sdk-metric-reports/IXm7L1FbPH.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (c6a8851) and merge commit (ccbff16).

Test Logs

• Base (c6a8851): https://github.com/firebase/firebase-js-sdk/actions/runs/10509900088
• Merge (ccbff16): https://github.com/firebase/firebase-js-sdk/actions/runs/10515311572

1. https://storage.googleapis.com/firebase-sdk-metric-reports/bJzPKk0zWT.html

[hsubox76]

Approved but make sure to run docgen before merging.