spec: add forward links from 'method set' to where it gets used
spec: add forward links from 'method set' to where it gets used

Fixes issue 1797.

R=golang-dev, gri
CC=golang-dev
http://codereview.appspot.com/5645058

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