godoc: consistent placement of documentation sections
godoc: consistent placement of documentation sections

Fixes issue 1226.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/5694052

apparentlymart/golang,dsriram/golang,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,gnanderson/go,tv42/old-go,tv42/old-go,apparentlymart/golang,dsriram/golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,dsriram/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,tv42/old-go,dsriram/golang,dsriram/golang,apparentlymart/golang,gnanderson/go,gnanderson/go,gnanderson/go,pombredanne/go-deleteme,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go