Rollup merge of #37119 - durka:patch-31, r=steveklabnik
Rollup merge of #37119 - durka:patch-31, r=steveklabnik

book: remove backticks in Type Aliases header

Fix #37116.

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