Auto merge of #30292 - Xmasreturns:patch-3, r=steveklabnik
Auto merge of #30292 - Xmasreturns:patch-3, r=steveklabnik

Updated structs.md in the book

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