sort: clarify Less doc
clarifies the requirements for Less
Fixes https://github.com/golang/go/issues/73420
Change-Id: I7d49b10fad78c618d946b3bb161ce19680ede47a
GitHub-Last-Rev:
7a49ad81923048bfc99b265dd89f012eefcf5699
GitHub-Pull-Request: golang/go#74333
Reviewed-on: https://go-review.googlesource.com/c/go/+/683275
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>