Define Pezkuwi's fungible (PEZ-20) and non-fungible (PEZ-721) token
standards as a naming + interface convention over the existing
pallet-assets and pallet-nfts on Asset Hub — the familiar ERC-20/721
mental model mapped to native runtime calls.
Documentation only: no runtime code, no chain upgrade, no spec bump.
The docs generator picks this up as a top-level 'Token Standards'
sidebar entry from the filename.
