wiki: remove broken link Change-Id: I84ff90010795ac9184f2225c7a8c23c26b2df081 GitHub-Last-Rev: 4edb18e460f96975d60d292ce079dbe5e77c4fbf GitHub-Pull-Request: golang/wiki#2 Reviewed-on: https://go-review.googlesource.com/c/wiki/+/550495 Reviewed-by: Yann Salaün <yannsalaun1@gmail.com> Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>