cmd/tailscale/cli: remove Latin abbreviations from CLI help text

Our style guide recommends avoiding Latin abbreviations in technical
documentation, which includes the CLI help text. This is causing linter
issues for the docs site, because this help text is copied into the docs.
See http://go/style-guide/kb/language-and-grammar/abbreviations#latin-abbreviations

Updates #cleanup

Change-Id: I980c28d996466f0503aaaa65127685f4af608039
Signed-off-by: Alex Chan <alexc@tailscale.com>

cmd/tailscale/cli/set.go

@@ -110,7 +110,7 @@ func newSetFlagSet(goos string, setArgs *setArgsT) *flag.FlagSet {
 	switch goos {
 	case "linux":
 		setf.BoolVar(&setArgs.snat, "snat-subnet-routes", true, "source NAT traffic to local routes advertised with --advertise-routes")
-		setf.BoolVar(&setArgs.statefulFiltering, "stateful-filtering", false, "apply stateful filtering to forwarded packets (subnet routers, exit nodes, etc.)")
+		setf.BoolVar(&setArgs.statefulFiltering, "stateful-filtering", false, "apply stateful filtering to forwarded packets (subnet routers, exit nodes, and so on)")
 		setf.StringVar(&setArgs.netfilterMode, "netfilter-mode", defaultNetfilterMode(), "netfilter mode (one of on, nodivert, off)")
 	case "windows":
 		setf.BoolVar(&setArgs.forceDaemon, "unattended", false, "run in \"Unattended Mode\" where Tailscale keeps running even after the current GUI user logs out (Windows-only)")

cmd/tailscale/cli/up.go

@@ -122,7 +122,7 @@ func newUpFlagSet(goos string, upArgs *upArgsT, cmd string) *flag.FlagSet {
 	switch goos {
 	case "linux":
 		upf.BoolVar(&upArgs.snat, "snat-subnet-routes", true, "source NAT traffic to local routes advertised with --advertise-routes")
-		upf.BoolVar(&upArgs.statefulFiltering, "stateful-filtering", false, "apply stateful filtering to forwarded packets (subnet routers, exit nodes, etc.)")
+		upf.BoolVar(&upArgs.statefulFiltering, "stateful-filtering", false, "apply stateful filtering to forwarded packets (subnet routers, exit nodes, and so on)")
 		upf.StringVar(&upArgs.netfilterMode, "netfilter-mode", defaultNetfilterMode(), "netfilter mode (one of on, nodivert, off)")
 	case "windows":
 		upf.BoolVar(&upArgs.forceDaemon, "unattended", false, "run in \"Unattended Mode\" where Tailscale keeps running even after the current GUI user logs out (Windows-only)")