util(cksum): Fix non-idiomatic comments

Author: RenjiSann

src/uu/cksum/src/cksum.rs

@@ -203,11 +203,9 @@ mod options {
     pub const ZERO: &str = "zero";
 }
 
-/***
- * cksum has a bunch of legacy behavior.
- * We handle this in this function to make sure they are self contained
- * and "easier" to understand
- */
+/// cksum has a bunch of legacy behavior.
+/// We handle this in this function to make sure they are self contained
+/// and "easier" to understand
 fn handle_tag_text_binary_flags<S: AsRef<OsStr>>(
     args: impl Iterator<Item = S>,
 ) -> UResult<(bool, bool)> {

src/uucore/src/lib/features/checksum.rs

@@ -1115,9 +1115,7 @@ fn process_checksum_file(
     Ok(())
 }
 
-/***
- * Do the checksum validation (can be strict or not)
-*/
+/// Do the checksum validation (can be strict or not)
 pub fn perform_checksum_validation<'a, I>(
     files: I,
     algo_name_input: Option<&str>,