Update google-login.md

[rabarijaona]

Update collection creation instructions.

Description

I was not able to locate easily the place where I have to create the users collection. Feel free to change, if needed.

Linear ticket and magic word Fixes DEVR-XXX

Type of change

• [ ] Typo fix
• [ ] New feature
• [x] Enhancement to current docs
• [ ] Removed outdated references
• [ ] Update assets

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