Users should not invoke "go tool doc" directly, but should instead run
"go doc". Remove "cmd/doc" because it no longer invokes the "doc" tool
but incorporates its logic directly.
Fixes #74667
Change-Id: I357a3d7e0ca075f028df66e34951a41354c08941
Reviewed-on: https://go-review.googlesource.com/c/go/+/689835 Reviewed-by: Michael Matloob <matloob@google.com>
Auto-Submit: Michael Matloob <matloob@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>