Update library/core/src/fmt/builders.rs
Update library/core/src/fmt/builders.rs

Co-authored-by: Yuki Okushi <85857f4af0f1ba28967e979a9055a2f74102998d@gmail.com>
graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust