go-tour: don't use a pointer to a map in web crawl exercise It's unnecessary and misleading. Fixes issue 6322.
go-tour: don't use a pointer to a map in web crawl exercise
It's unnecessary and misleading.
Fixes issue 6322.

R=adg, dsymonds
CC=golang-dev
https://codereview.appspot.com/13361050

Go-zh/tour-old,minux/go-tour-zh,Go-zh/tour-old,minux/go-tour-zh