concurrency: fix typo in Serializable godoc
@@ -46,7 +46,7 @@ const (
// SerializableSnapshot provides serializable isolation and also checks
// for write conflicts.
SerializableSnapshot Isolation = iota
- // Serializable reads within the same transactiona attempt return data
+ // Serializable reads within the same transaction attempt return data
// from the at the revision of the first read.
Serializable
// RepeatableReads reads within the same transaction attempt always
