A+C: Ato Araki (individual CLA)

Generated by addca.

R=gobot
CC=golang-dev
https://codereview.appspot.com/21790043
go/doc: add full stop of Japanese, Chinese and Korean.

This fix will show a good synopsis on package listings in that languages.

R=adg, r
CC=golang-dev
https://codereview.appspot.com/21130043

Committer: Andrew Gerrand <adg@golang.org>