Docs: Add details to `taginfoProjectInfo`

[tordans]

This extends the docs for taginfoProjectInfo, based on the feedback in https://github.com/openstreetmap/id-tagging-schema/issues/919#issuecomment-1586022643

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Closes https://github.com/openstreetmap/id-tagging-schema/issues/919

[1ec5]

This is a good change, but people looking at the iD Tagging Schema project in taginfo won’t know to look in this repository. If this build script appends the decoder ring to the description property, people would see it directly inside taginfo:

https://github.com/ideditor/schema-builder/blob/8f6c4ee3b3f525892b33315e211fe925011b53e5/lib/build.js#L491

[tordans]

@1ec5 agreed, but lets move your comment in a new issue; they can be handled separately, right?

[1ec5]

What’s the purpose of putting the decoder ring here, in the documentation about build options, if it only matters to people who view the project file in taginfo?

[tyrasd]

If this build script appends the decoder ring to the description property, people would see it directly inside taginfo:

implemented in c0f3fb5f742ae42c86280fc428606f9b2b2a3a0b