uucore: mark comment as rustdoc

src/uucore/src/lib/lib.rs

@@ -222,9 +222,9 @@ pub fn read_yes() -> bool {
  }
 }
 
-// Helper function for processing delimiter values (which could be non UTF-8)
-// It converts OsString to &[u8] for unix targets only
-// On non-unix (i.e. Windows) it will just return an error if delimiter value is not UTF-8
+/// Helper function for processing delimiter values (which could be non UTF-8)
+/// It converts OsString to &[u8] for unix targets only
+/// On non-unix (i.e. Windows) it will just return an error if delimiter value is not UTF-8
 pub fn os_str_as_bytes(os_string: &OsStr) -> mods::error::UResult<&[u8]> {
  #[cfg(unix)]
  let bytes = os_string.as_bytes();