Fix typo in overriden -> overridden

edit/buildozer.go

diff --git a/edit/buildozer.go b/edit/buildozer.go
index 78538c8..1df8a9f 100644
--- a/edit/buildozer.go
+++ b/edit/buildozer.go
@@ -58,7 +58,7 @@
 	return &Options{NumIO: 200, PreferEOLComments: true}
 }
 
-// Usage is a user-overriden func to print the program usage.
+// Usage is a user-overridden func to print the program usage.
 var Usage = func() {}
 
 var fileModified = false // set to true when a file has been fixed