all: fix typos Change-Id: I4b7b0fb92d900e51df98141c11b4a5c3f946c288 Reviewed-on: https://go-review.googlesource.com/c/wiki/+/595417 Commit-Queue: Ian Lance Taylor <iant@golang.org> Auto-Submit: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>