Rollup merge of #105655 - RedDocMD:bug-105645, r=oli-obk

Remove invalid case for mutable borrow suggestion

If we have a call such as `foo(&mut buf)` and after reference
collapsing the type is inferred as `&T` where-as the required type is
`&mut T`, don't suggest `foo(&mut mut buf)`. This is wrong syntactically
and the issue lies elsewhere, not in the borrow.

Fixes #105645

diff --cc compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
Simple merge