Address simple linter issues

api/docgen/docgen.go

@@ -24,6 +24,8 @@ import (
 	"github.com/libp2p/go-libp2p/core/peer"
 	"github.com/libp2p/go-libp2p/core/protocol"
 	"github.com/multiformats/go-multiaddr"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 
 	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-bitfield"
@@ -456,7 +458,8 @@ func exampleStruct(method string, t, parent reflect.Type) interface{} {
 		if f.Type == parent {
 			continue
 		}
-		if strings.Title(f.Name) == f.Name {
+		caser := cases.Title(language.English)
+		if caser.String(f.Name) == f.Name {
 			ns.Elem().Field(i).Set(reflect.ValueOf(ExampleValue(method, f.Type, t)))
 		}
 	}