Fix up whitespace in headers for doc.go.

Also, set sensible defaults for the command-line arguments to doc.go.

Change-Id: Iefd2ade4c9095489efa0ae1059007593fc84923a
diff --git a/util/doc.go b/util/doc.go
index 7c96af8..48eac61 100644
--- a/util/doc.go
+++ b/util/doc.go
@@ -582,8 +582,8 @@
 
 func main() {
 	var (
-		configFlag *string = flag.String("config", "", "Location of config file")
-		outputDir  *string = flag.String("out", "", "Path to the directory where the output will be written")
+		configFlag *string = flag.String("config", "doc.config", "Location of config file")
+		outputDir  *string = flag.String("out", ".", "Path to the directory where the output will be written")
 		config     Config
 	)