spec: add () to method calls in examples
spec: add () to method calls in examples

Since p.M is rejected (must call methods), use p.M(),
to keep the examples compiling.

Fixes issue 4441.

R=gri
CC=golang-dev
http://codereview.appspot.com/6854096
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go