SNOW-1756807: Add note about GCP regional endpoints

[sfc-gh-dprzybysz]

Description

SNOW-175680

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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