Fix docs link
Fix docs link

— Elliot Jackson <elliot@elliotekj.com>

steveklabnik/crates.io,steveklabnik/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,steveklabnik/crates.io,steveklabnik/crates.io