go spec: make condition mandatory in if statements
go spec: make condition mandatory in if statements

Plus a few minor HTML fixes.

Fixes issue 1535.

R=r, rsc, ken2, iant, r2
CC=golang-dev
http://codereview.appspot.com/4185065

Committer: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang