Add tests for Geolocation module

[gandreadis]

Summary

This PR adds a number of unit tests for the Geolocation module, as a follow-up of #23903. I also added two missing documentation strings to that module, with references to the online documentation, for consistency with the other methods in the same module.

Changelog

Not applicable, since it only adds tests.

Test Plan

Not applicable, since it only adds tests (this PR is its own testing plan 😛).

[pull-bot]

Messages

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[cpojer]

Nice, thanks for adding tests to this module.

[facebook-github-bot]

@cpojer is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @gandreadis in 6047d42.

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