docs: Update erc1155.adoc with a Better Description and Implementation Example

[0xNeshi]

What is the feature you would like to see?

Currently missing both.

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[Peponks9]

Since #761 is on finales stages, would love to contribute to this one too @0xNeshi

[0xNeshi]

@Peponks9 of course, it's yours!

You can use erc20.adoc and erc721.adoc as inspiration.