This style point came up in the feedback on #923, where a lack of
explicit branching in a pattern made a proof more confusing.

I've also moved another pattern-based style point into the newly-created
section just to take advantage of the increased organisation.

This reverts merge request !881

see https://github.com/tonsky/FiraCode/wiki/VS-Code-Instructions

This note is obsolete due to iris/iris!640