Remove outdated comment

Signed-off-by: Alessandro Passaro <[email protected]>

mountpoint-s3/src/fs.rs

@@ -1131,10 +1131,6 @@ where
         //   process. In many cases, the child will then immediately close (flush) the duplicated
         //   file descriptors. We will not complete the upload if we can detect that the process
         //   invoking flush is different from the one that originally opened the file.
-        //
-        // The same for read path. We want to stop the prefetcher and decrease the reader count
-        // as soon as users close a file descriptor so that we don't block users from doing other
-        // operation like overwrite the file.
         let file_handle = {
             let file_handles = self.file_handles.read().await;
             match file_handles.get(&fh) {