gofix: fix godoc doc

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4290049
diff --git a/src/cmd/gofix/doc.go b/src/cmd/gofix/doc.go
index e267d5d..902fe76 100644
--- a/src/cmd/gofix/doc.go
+++ b/src/cmd/gofix/doc.go
@@ -24,7 +24,7 @@
 or partially updated code even without using the -r flag.
 
 Gofix prints the full list of fixes it can apply in its help output;
-to see them, run godoc -?.
+to see them, run gofix -?.
 
 Gofix does not make backup copies of the files that it edits.
 Instead, use a version control system's ``diff'' functionality to inspect