doc/effective_go.html: use correct name in Interface Checks section Fixes issue 4897.
doc/effective_go.html: use correct name in Interface Checks section
Fixes issue 4897.

R=golang-dev, adg
CC=golang-dev
https://codereview.appspot.com/7377061
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go