Update src/component/tooltip/TooltipHTMLContent.ts
Update src/component/tooltip/TooltipHTMLContent.ts

Co-authored-by: Zhongxiang.Wang <e4b5170b3c5acc60c5e3d8c12ab1526de8b7c9a9@all-my-life.cn>
apache/incubator-echarts,apache/incubator-echarts