Auto merge of #30329 - salty-horse:punctuation, r=steveklabnik
Auto merge of #30329 - salty-horse:punctuation, r=steveklabnik

Missing period at the end of a sentence.

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