dtoc: Fix some minor errors

Fix some comments and a printf string which is incorrect.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/dtoc.py b/tools/dtoc/dtoc.py
index c891b06..2e6a4db 100755
--- a/tools/dtoc/dtoc.py
+++ b/tools/dtoc/dtoc.py
@@ -40,8 +40,8 @@
     """Run all the test we have for dtoc
 
     Args:
-        args: List of positional args provided to binman. This can hold a test
-            name to execute (as in 'binman -t testSections', for example)
+        args: List of positional args provided to dtoc. This can hold a test
+            name to execute (as in 'dtoc -t test_empty_file', for example)
     """
     import test_dtoc