Rollup merge of #70649 - GuillaumeGomez:cleanup-e0468, r=Dylan-DPC
Rollup merge of #70649 - GuillaumeGomez:cleanup-e0468, r=Dylan-DPC

clean up E0468 explanation

r? @Dylan-DPC

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