Auto merge of #28182 - jackwilsonv:patch-2, r=steveklabnik

Auto merge of #28182 - jackwilsonv:patch-2, r=steveklabnik

r? @steveklabnik

##### About the `struct` section specifically:
I wasn't sure how you'd feel about the first instance since it was originally capitalized, happy to change it back if you think that's better.

Also, I left 'tuple struct' as is since together it isn't a keyword. The first instance currently has single quotes but the others have nothing. I think that feels right.

##### Generally:
I'm working through the book now and I'm happy to keep updating this branch with any formatting tweaks or updates I find if that's easier for you guys, otherwise I'll just create smaller PRs as I go. Just let me know.