#![deny(clippy::missing_safety_doc)]: Add (already fixed) (#1306)

* Fixes `#![deny(clippy::missing_safety_doc)]` of #1270.

This already passes without errors, unlike
`#![deny(clippy::undocumented_unsafe_blocks)]` in #1305.

Author: kkysen

lib.rs

@@ -7,6 +7,7 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 #![allow(clippy::all)]
 #![deny(clippy::undocumented_unsafe_blocks)]
+#![deny(clippy::missing_safety_doc)]
 
 #[cfg(not(any(feature = "bitdepth_8", feature = "bitdepth_16")))]
 compile_error!("No bitdepths enabled. Enable one or more of the following features: `bitdepth_8`, `bitdepth_16`");