docs: Fix typo on BigQuery's instructions

[albertlieyingadrian]

[docs: Fix typo on BigQuery's instructions]

Summary of Changes

Fixing a typo on Bigquery's instructions

Tests

N/A

Documentation

Reflected on the PR

CheckList

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[boring-cyborg]

Congratulations on your first Pull Request and welcome to Amundsen community! If you have any issues or are unsure about any anything please check our Contribution Guide (https://github.com/amundsen-io/amundsen/blob/main/CONTRIBUTING.md)

[boring-cyborg]

Awesome work, congrats on your first merged pull request!