Rollup merge of #57050 - RyanMarcus:master, r=zackmdavis
Rollup merge of #57050 - RyanMarcus:master, r=zackmdavis

Fixed typo in HashMap documentation

Previously "with a custom type as key", now "with a custom key type"

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