Clarify description of .width-comfortable

[dylanatsmith]

What are you trying to accomplish?

The width-comfortable class sets a max-width value, not width.

What approach did you choose and why?

N/A

What should reviewers focus on?

N/A

Can these changes ship as is?

• Yes, this PR does not depend on additional changes. 🚢

[changeset-bot]

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Latest commit: 00212b4

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