Rollup merge of #32906 - jocki84:jocki84-book-size, r=steveklabnik
Rollup merge of #32906 - jocki84:jocki84-book-size, r=steveklabnik

Reword explanation of 'size' types.

Do not reference machine 'pointers' in explanation of 'size' types.

I think the number of elements that can be directly addressed is a fundamental feature of a machine architecture in its own right. The fact that it coincides with the ‘size’ of a pointer should be viewed as an ‘implementation detail’ ;)

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