docs: clarify module dependency for Zora Media ERC-721 contracts

[stalim17]

This PR adds a note to the documentation clarifying that Zora's ERC-721 media contracts depend on the ModuleManager interface
and must be initialized through the Zora Creator Factory when deployed on mainnet.
This helps developers understand the required deployment flow when integrating custom modules.

Description

Motivation and Context

Does this change the ABI/API?

• This changes the ABI/API

What tests did you add/modify to account for these changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New module / feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I added a changeset to account for this change

Reviewer Checklist:

• My review includes a symposis of the changes and potential issues
• The code style is enforced
• There are no risky / concerning changes / additions to the PR