Rollup merge of #35794 - cantino:fix-typo, r=apasel422
Rollup merge of #35794 - cantino:fix-typo, r=apasel422

Fix minor typo

Minor typo in the book.

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