SNOW-1756807: Add note about GCP regional endpoints

[sfc-gh-dprzybysz]

Description

SNOW-175680

Checklist

• [x] Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• [x] Create tests which fail without the change (if possible)
• [x] Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• [x] Extend the README / documentation and ensure is properly displayed (if necessary)
• [x] Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.92%. Comparing base (c748d3b) to head (751f2a6). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #942 +/- ## ========================================== + Coverage 88.90% 88.92% +0.01% ========================================== Files 66 66 Lines 6455 6455 ========================================== + Hits 5739 5740 +1 + Misses 716 715 -1 ```

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