Rollup merge of #128049 - compiler-errors:E0626, r=petrochenkov

Reword E0626 to mention static coroutine, add structured suggestion for adding `static`

Not certain how to make the example feel less artificial. 🤷

My main point though is that we should probably emphasize that the first solution to making a coroutine allow a borrow across an await is making it `static`.

Also adds a structured suggestion.

Author: matthiaskrgr