docs: update Parcel MDX plugin for MDX 3

[TechQuery]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

Parcel official MDX plugin is only support MDX 1, so I publish a new plugin for MDX 3.