chore: fix struct field name in comment (#4284)

Signed-off-by: dashangcun <907225865@qq.com>

features/inbound/inbound.go

@@ -25,7 +25,7 @@ type Handler interface {
 // xray:api:stable
 type Manager interface {
 	features.Feature
-	// GetHandlers returns an InboundHandler for the given tag.
+	// GetHandler returns an InboundHandler for the given tag.
 	GetHandler(ctx context.Context, tag string) (Handler, error)
 	// AddHandler adds the given handler into this Manager.
 	AddHandler(ctx context.Context, handler Handler) error