Chapter 5.1: grammatical number disagreement

[jruderman]

• I have checked the latest main branch to see if this has already been fixed
• I have searched existing issues and pull requests for duplicates

URL to the section(s) of the book with this problem:

https://doc.rust-lang.org/book/ch05-01-defining-structs.html

Description of the problem:

This is a deliberate choice because we want instances of this struct to own all of its data and for that data to be valid for as long as the entire struct is valid.

"instances ... its data" and "instances ... the entire struct"

Suggested fix:

• Change "instances" to "each instance"