Update server/domain_type.go

Co-authored-by: Ethen <ethenpo@gmail.com>

server/domain_type.go

@@ -9,7 +9,7 @@ var (
 	ErrInvalidDomainType = fmt.Errorf("invalid domain type")
 )
 
-// DomainType is a enumeration type for the different data domains for which a
+// DomainType is an enumeration type for the different data domains for which a
 // blob can exist between
 type DomainType uint8