net/mail: remove the commented out code

Author: noahchiu22

src/net/mail/message.go

@@ -549,8 +549,7 @@ func (p *addrParser) consumeAddrSpec() (spec string, err error) {
 
 	// domain = dot-atom / domain-literal
 	var domain string
-	// domain part does not allow whitespace characters, so skipSpace cannot be called here
-	// p.skipSpace()
+
 	if p.empty() {
 		return "", errors.New("mail: no domain in addr-spec")
 	}