lib/godoc: removing leading / from search links
lib/godoc: removing leading / from search links

srcLink includes the / now; adding another yields //,
which means something else entirely in URLs.

Fixes issue 3327.

R=golang-dev, gri
CC=golang-dev
http://codereview.appspot.com/5823060

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