Address review comments

Author: LeSeulArtichaut

rust/kernel/pages.rs

@@ -127,7 +127,7 @@ impl<const ORDER: u32> Pages<ORDER> {
         // so `offset` can't overflow an `isize`.
         let dest = unsafe { (mapping.ptr as *mut u8).add(offset) };
         // SAFETY: `src` is guaranteed by the caller to be valid for reads, and `dest` is
-        //valid for writes from the type invariants. Because we're copying `u8`s
+        // valid for writes from the type invariants. Because we're copying `u8`s
         // which have an alignment of 1, `src` and `dest` are always properly aligned.
         unsafe { ptr::copy(src, dest, len) };
         Ok(())

rust/kernel/print.rs

@@ -138,9 +138,7 @@ pub unsafe fn call_printk(
     args: fmt::Arguments<'_>,
 ) {
     // `_printk` does not seem to fail in any path.
-    // SAFETY: references are guaranteed to be valid for reads.
-    // The caller guarantees that `format_string` is a valid format
-    // specifier and that `module_name` is null-terminated.
+    // SAFETY: this is safe by the safety contract.
     unsafe {
         bindings::_printk(
             format_string.as_ptr() as _,