doc/go1.3.html: math/big's Int and Rat implement TextMarshaler, TextUnmarshaler
doc/go1.3.html: math/big's Int and Rat implement TextMarshaler, TextUnmarshaler

Update issue 8112

LGTM=r
R=r
CC=golang-codereviews
https://codereview.appspot.com/95640043

apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang