DocC documentation content fixes. (#6)

This PR contains the work done to:
* Fix some documentation issues encountered in the `README` file;
* Fix some documentation issues encountered in the `Library` article of the DocC documentation catalog;
* Update the DocC documentation of the library for GitHub Pages.

Reviewed-on: #6
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

docs/data/documentation/amiiboservice/amiiboserviceerror/!=(_:_:).json

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