64e737c07c
rustdoc: Add mutable to the description Add mutable the description to differentiate [as_simd](https://github.com/rust-lang/rust/blob/master/library/core/src/slice/mod.rs#L3654) from [as_simd_mut](https://github.com/rust-lang/rust/blob/master/library/core/src/slice/mod.rs#L3654).