Update 2.configuration.md

[Triloworld]

Clarify about api keys that are used. I get from Google and no hint there that are used and what's they name. Only "Easy start" provide one time it as a example of file not a variable

Types of changes

• [ ] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes (if not applicable, please state why)

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[Baroshem]

Hey @Triloworld

Sorry but I completely missed this PR. I am merging it right now. Thanks for that :)