liqoctl: replace deprecated function

go.mod

@@ -36,6 +36,7 @@ require (
 	golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	golang.org/x/sys v0.0.0-20220517195934-5e4e11fc645e
+	golang.org/x/text v0.3.7
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20220330030906-9490840b0b01
 	gomodules.xyz/jsonpatch/v2 v2.2.0
 	google.golang.org/api v0.74.0
@@ -213,7 +214,6 @@ require (
 	golang.org/x/net v0.0.0-20220325170049-de3da57026de // indirect
 	golang.org/x/oauth2 v0.0.0-20220309155454-6242fa91716a // indirect
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
-	golang.org/x/text v0.3.7 // indirect
 	golang.org/x/time v0.0.0-20220224211638-0e9765cccd65 // indirect
 	golang.org/x/tools v0.1.10 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect

pkg/liqoctl/docs/handler.go

@@ -24,6 +24,8 @@ import (
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/cobra/doc"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 )
 
 // Options encapsulates the arguments of the docs command.
@@ -44,7 +46,7 @@ func (o *Options) Run(ctx context.Context) error {
 			hdrFunc := func(filename string) string {
 				base := filepath.Base(filename)
 				name := strings.TrimSuffix(base, path.Ext(base))
-				title := strings.Title(strings.ReplaceAll(name, "_", " "))
+				title := cases.Title(language.English).String(strings.ReplaceAll(name, "_", " "))
 				return fmt.Sprintf("---\ntitle: %q\n---\n\n", title)
 			}