])

1. Clarify that `String::split_off` returns one string and modifies self
   in-place. The documentation implied that it returns two new strings.

2. Make the documentation mirror `Vec::split_off`.

Correct a typo in procedural macros chapter of the Book.

A simple and short correction for procedural macros chapter of the Rust Programming Language Book.

…illaumeGomez

Fix wording in LocalKey documentation

Fixes rust-lang#39841

r? @GuillaumeGomez

code order tweak

… r=frewsxcv

Fixup String::split_off documentation

1. Clarify that `String::split_off` returns one string and modifies self in-place. The documentation implied that it returns two new strings.

2. Make the documentation mirror `Vec::split_off`.

…wsxcv

Add missing urls for env functions

r? @frewsxcv