Guide to get the L2 NFTs of a given collection

[Ginowine]

Description of change

This guide would show users how to get the L2 NFTs of a given collection owned by an account using the getL2NFTsInCollection function from the ISCAccount magic contract.

Links to any relevant issues

fixes issue #1633 .

Type of change

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• Documentation Enhancement

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• [x] I have followed the contribution guidelines for this project
• [x] I have performed a self-review of my own changes
• [x] I have made sure that added/changed links still work
• [ ] I have commented my code, particularly in hard-to-understand areas

[Ginowine]

@lucas-tortora, here is a new PR. Please review when you are chanced.

[github-actions[bot]]

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