tree bab9dff8a18ca8080ef695c83173942fe7e4ff35
parent f0f03ea20adfe5d3e94ab983c1a17d8edaccf399
author Francesc Campoy <campoy@golang.org> 1436905472 -0700
committer Francesc Campoy Flores <campoy@golang.org> 1436997277 +0000

tour: add clarification on binary tree exercise

Fixes golang/go#11692

Change-Id: I880e65c482a1b544cbf5a9e27b8ddc9174e087e7
Reviewed-on: https://go-review.googlesource.com/12179
Reviewed-by: Andrew Gerrand <adg@golang.org>