add blank line in docstring

Author: tfeldmann

fs/move.py

@@ -142,6 +142,7 @@ def move_dir(
         fs.errors.DirectoryExpected: if ``src_path`` or one of its
             ancestors is not a directory.
         fs.errors.IllegalDestination: when moving a folder into itself
+
     """
     with manage_fs(src_fs, writeable=True) as _src_fs:
         with manage_fs(dst_fs, writeable=True, create=True) as _dst_fs: