Run lintpy for reggen/tlgen/topgen

Signed-off-by: Weicai Yang <weicai@google.com>
diff --git a/util/tlgen/doc.py b/util/tlgen/doc.py
index a2c1f6f..5c0037d 100644
--- a/util/tlgen/doc.py
+++ b/util/tlgen/doc.py
@@ -6,6 +6,7 @@
 import logging as log
 
 from reggen.validate import val_types
+
 from .validate import root
 
 doc_intro = """