A+C: add Gabriel Aszalos (individual CLA)

LGTM=bradfitz
R=adg, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/162580043
cmd/go: fixed typo in doc and generator

LGTM=iant
R=golang-codereviews, iant, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/163690043

Committer: Ian Lance Taylor <iant@golang.org>