doc: update go1.4.html's minor library changes.
doc: update go1.4.html's minor library changes.

LGTM=r
R=r
CC=golang-codereviews
https://codereview.appspot.com/173920043

tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go,tv42/old-go