docs: mark upstreams for all upstreams

pkg/upstream/stack/loader.go

@@ -1,4 +1,4 @@
-package stack
+package stack // https://github.com/docker/cli/blob/master/cli/command/stack/loader/loader.go
 
 import (
 	"fmt"

pkg/upstream/stack/options.go

@@ -1,4 +1,4 @@
-package stack
+package stack // https://github.com/docker/cli/blob/master/cli/command/stack/options/opts.go
 
 // Deploy holds docker stack deploy options
 type Deploy struct {

pkg/upstream/stack/remove.go

@@ -1,4 +1,4 @@
-package stack
+package stack // https://github.com/docker/cli/blob/master/cli/command/stack/remove.go
 
 import (
 	"context"

pkg/upstream/stack/stack.go

@@ -1,4 +1,4 @@
-package stack
+package stack // https://github.com/docker/cli/blob/master/cli/command/stack/swarm/common.go
 
 import (
 	"context"