all: fix typo in GitHub Change-Id: I1c20561e99a0997787dcb34c1493a58e3c8e82f2 Reviewed-on: https://go-review.googlesource.com/c/wiki/+/595756 Commit-Queue: Ian Lance Taylor <iant@golang.org> Auto-Submit: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>