Book: Update raw/byte string literal in syntax index
Book: Update raw/byte string literal in syntax index

The raw byte string literal syntax in the syntax index was incorrect. Also added links to the reference for raw and/or byte string literals.

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