remove redundant docstring

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/cloudfetch/download_manager.py

@@ -67,7 +67,6 @@ def get_next_downloaded_file(self, next_row_offset: int) -> DownloadedFile:
         # Make sure the download queue is always full
         self._schedule_downloads()
 
-        # No more files to download from this batch of links
         while len(self._download_tasks) == 0:
             if self._thread_pool._shutdown:
                 raise Error("download manager shut down before file was ready")