lib/godoc: use Type.Name directly
lib/godoc: use Type.Name directly

Also: remove an unused template variable declaration.

R=adg
CC=golang-dev
http://codereview.appspot.com/5572043

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