cmd/cloner: fix typo in test type's name

s/SliceContianer/SliceContainer/g

Updates #9604

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

cmd/cloner/clonerex/clonerex.go

@@ -1,10 +1,10 @@
 // Copyright (c) Tailscale Inc & AUTHORS
 // SPDX-License-Identifier: BSD-3-Clause
 
-//go:generate go run tailscale.com/cmd/cloner  -clonefunc=true -type SliceContianer
+//go:generate go run tailscale.com/cmd/cloner  -clonefunc=true -type SliceContainer
 
 package clonerex
 
-type SliceContianer struct {
+type SliceContainer struct {
 	Slice []*int
 }