Warn about the distance in the documentation

[louismaximepiton]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Add a callout in the doc, probably in the accessibility and Max-width paragraph to tell people the max-width shouldn't be too wide and explicitely tell that the max-width should be used when not used inside a container.
It should be there for every component that has a max-width.

Motivation and context

Better take into account the a11y inside our doc