shared-memory: clippy fixes (docs)

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

proxmox-shared-memory/src/lib.rs

@@ -192,12 +192,21 @@ impl <T: Sized + Init> SharedMemory<T> {
 }
 
 /// Helper to initialize nested data
+///
+/// # Safety
+///
+/// This calls `Init::initialize`, it is up to the user to ensure this is safe. The value should
+/// not have been initialized at this point.
 pub unsafe fn initialize_subtype<T: Init>(this: &mut T) {
     let data: &mut MaybeUninit<T> = std::mem::transmute(this);
     Init::initialize(data);
 }
 
 /// Helper to call 'check_type_magic' for nested data
+///
+/// # Safety
+///
+/// This calls `Init::check_type_magic`, it is up to the user to ensure this is safe.
 pub unsafe fn check_subtype<T: Init>(this: &T) -> Result<(), Error> {
     let data: &MaybeUninit<T> = std::mem::transmute(this);
     Init::check_type_magic(data)