net/smtp: clarify that SendMail's auth param is optional

It wasn't obvious that the Auth could be nil.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13060048

diff --git a/src/pkg/net/smtp/smtp.go b/src/pkg/net/smtp/smtp.go
index 212c96c1d51cb811789b512bc4d0575b3a8aaec7..a0a478a85246460d5240bde853455bc7a667746b 100644 (file)
--- a/src/pkg/net/smtp/smtp.go
+++ b/src/pkg/net/smtp/smtp.go
@@ -264,9 +264,10 @@ func (c *Client) Data() (io.WriteCloser, error) {
        return &dataCloser{c, c.Text.DotWriter()}, nil
 }
 
-// SendMail connects to the server at addr, switches to TLS if possible,
-// authenticates with mechanism a if possible, and then sends an email from
-// address from, to addresses to, with message msg.
+// SendMail connects to the server at addr, switches to TLS if
+// possible, authenticates with the optional mechanism a if possible,
+// and then sends an email from address from, to addresses to, with
+// message msg.
 func SendMail(addr string, a Auth, from string, to []string, msg []byte) error {
        c, err := Dial(addr)
        if err != nil {