Descriptionnet/smtp: clarify that SendMail's auth param is optional
It wasn't obvious that the Auth could be nil.
Patch Set 1 #Patch Set 2 : diff -r cddeaea05b11 https://go.googlecode.com/hg/ #Patch Set 3 : diff -r cddeaea05b11 https://go.googlecode.com/hg/ #Patch Set 4 : diff -r cddeaea05b11 https://go.googlecode.com/hg/ #Patch Set 5 : diff -r 1e3289919b26 https://go.googlecode.com/hg/ #MessagesTotal messages: 3
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