gddo-server: fix bogus comment

This was accidentally left behind in abcff89 during review.

Change-Id: Ia259269a56e37754f4faf793b13deb9a918359a1
Reviewed-on: https://go-review.googlesource.com/114975
Reviewed-by: Tuo Shan <shantuo@google.com>
diff --git a/gddo-server/crawl.go b/gddo-server/crawl.go
index d85352e..f72a23e 100644
--- a/gddo-server/crawl.go
+++ b/gddo-server/crawl.go
@@ -26,7 +26,7 @@
 )
 
 // crawlNote is a message sent to Pub/Sub when a crawl occurs.
-// It is encoded with encoding/gob, so changes should match its
+// It is encoded as JSON, so changes should match its
 // compatibility requirements.
 type crawlNote struct {
 	ImportPath string