Rollup merge of #68869 - GuillaumeGomez:err-explanation-e0271, r=Dylan-DPC
Rollup merge of #68869 - GuillaumeGomez:err-explanation-e0271, r=Dylan-DPC

clean up E0271 explanation

r? @Dylan-DPC

graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust