Disable clippy::missing_safety_doc lint on Allocator trait

Author: ajtribick

src/raw/alloc.rs

@@ -33,6 +33,7 @@ mod inner {
     use crate::alloc::alloc::{alloc, dealloc, Layout};
     use core::ptr::NonNull;
 
+    #[allow(clippy::missing_safety_doc)] // not exposed outside of this crate
     pub unsafe trait Allocator {
         fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()>;
         unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout);