feat: add example token identifier

[obycode]

Description

Without this, it is unclear that the identifier should include the token name after a ::. This originated from a user not understanding why their query wasn't working.

Checklist

• [x] Conventional commits were used
• [ ] New links to files and images were verified
• [ ] For fixes/refactors: all existing references were identified and replaced
• [x] Style guide was reviewed and applied
• [x] Clear code samples were provided
• [x] People were tagged for review

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Name	Status	Preview	Comments	Updated (UTC)
hiro-systems-docs	❌ Failed (Inspect)			May 20, 2025 3:45pm

[ryanwaits]

v3.0.0 changed how we handle api references, closing and moving here: https://github.com/hirosystems/stacks-blockchain-api/pull/2324