Update responsive design docs
What does this MR do and why?
Follow-up from https://gitlab.slack.com/archives/CDNNDD1T3/p1732617827505109.
Updating ESLint and RoboCop rules in gitlab-org/frontend/eslint-plugin!136 (merged) and gitlab-org/ruby/gems/gitlab-styles!248 (merged)
References
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Edited by Peter Hegman