[Elixir] Improve exercise `file-sniffer`

exercism / v3

The work-in-progress project for developing v3 tracks

https://v3.exercism.io

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Closed angelikatyborska closed 3 years ago

angelikatyborska commented 3 years ago

This PR:

Rewords the introduction a bit.
Removes repetitive links from the introduction because we were supposed to keep links to the minimum there 🙊
Fixes the return values of the functions that need implementing to match instructions
mix format