Rollup merge of #107487 - edward-shen:edward-shen/107213-round-2, r=estebank

Make the "extra if in let...else block" hint a suggestion

Changes the hint to a suggestion, suggested in #107213.

r? ```@estebank```

diff --cc compiler/rustc_parse/src/parser/expr.rs
Simple merge

diff --cc tests/ui/rfc-2497-if-let-chains/ensure-that-let-else-does-not-interact-with-let-chains.stderr
Simple merge