fix reference to "smtp" section
documentation for "method" has reference to "mail" section.
"mail" section doesn't exist, changed to "smtp".
--- a/doc/hgrc.5.txt
+++ b/doc/hgrc.5.txt
@@ -140,7 +140,7 @@ email::
of outgoing messages.
method;;
Optional. Method to use to send email messages. If value is
- "smtp" (default), use SMTP (see section "[mail]" for
+ "smtp" (default), use SMTP (see section "[smtp]" for
configuration). Otherwise, use as name of program to run that
acts like sendmail (takes "-f" option for sender, list of
recipients on command line, message on stdin). Normally, setting