Fix typo in dynamodbattribute.UnixTime docs
@@ -14,7 +14,7 @@ import (
// and unmarshaled with DynamoDB AttributeValues it will be done so as number
// instead of string in seconds since January 1, 1970 UTC.
//
-// This type is useful as an alterntitive to the struct tag `unixtime` when you
+// This type is useful as an alternative to the struct tag `unixtime` when you
// want to have your time value marshaled as Unix time in seconds intead of
// the default time.RFC3339.
//
