Correct spelling (#36783)

I was testing typos-cli and fixed some misspelled wording here.
All changes are internal — no public API fields, database columns,
locale keys, or migration names are affected.

modules/setting/config/value.go

@@ -141,7 +141,7 @@ func (opt *Option[T]) WithDefaultSimple(def T) *Option[T] {
 	switch v.(type) {
 	case string, bool, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
 	default:
-		// TODO: use reflect to support convertable basic types like `type State string`
+		// TODO: use reflect to support convertible basic types like `type State string`
 		r := reflect.ValueOf(v)
 		if r.Kind() != reflect.Struct {
 			panic("invalid type for default value, use WithDefaultFunc instead")