`[method]_mut`: Mutable reference access

Suffix for access-style methods.

rust,compile_fail

# // Copyright 2025 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
impl<T> Vec<T> {
    // Simplified
    fn get_mut(&mut self, index: usize) -> Option<&mut T>;
}

impl<T> [T] {
    // Simplified
    fn iter_mut(&mut self) -> impl Iterator<Item = &mut T>;
}

impl str {
    fn from_utf8_mut(v: &mut [u8]) -> Result<&mut str, Utf8Error>;
}

<details> - Mut for Mutability

Suffix that signifies the method gives access to a mutable reference.

Requires mutable access to the value you're calling this method on.

</details>

`[method]_mut`: Mutable reference access

[method]_mut: Mutable reference access

`[method]_mut`: Mutable reference access