docs: finishing marketingData & removing attachmentId

[ganobrega]

• Created the mock of marketingData.
• Removed all "attachmentId" properties, cause apparently no longer exists.

What is the purpose of this pull request?

Documentation

What problem is this solving?

Documentation

How should this be manually tested?

vtexjs.checkout.orderForm on Developer Tools

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires change to documentation, which has been updated accordingly.
• Documentation