Rollup merge of #73479 - pickfire:liballoc-spell, r=dtolnay
Rollup merge of #73479 - pickfire:liballoc-spell, r=dtolnay

Minor tweaks to liballoc

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