doc/contrib.html: update links, mailing lists and link to 1.3 release note.
LGTM=adg R=golang-codereviews, r, adg CC=golang-codereviews https://golang.org/cl/102020045
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LGTM=adg R=golang-codereviews, r, adg CC=golang-codereviews https://golang.org/cl/102020045