Doc: Fix typo in revision.go
@@ -27,7 +27,7 @@ type revision struct {
// main is the main revision of a set of changes that happen atomically.
main int64
- // sub is the the sub revision of a change in a set of changes that happen
+ // sub is the sub revision of a change in a set of changes that happen
// atomically. Each change has different increasing sub revision in that
// set.
sub int64
