fixed Typescript type in Table example (#25337)
fixed Typescript type in Table example (#25337)

`columns` should not be an array. Here is the `columns` type that Table takes: https://github.com/ant-design/ant-design/blob/master/components/table/Table.tsx#L74

Thanks!
icaife/ant-design,zheeeng/ant-design,icaife/ant-design,ant-design/ant-design,ant-design/ant-design,ant-design/ant-design,ant-design/ant-design,icaife/ant-design,elevensky/ant-design,zheeeng/ant-design,elevensky/ant-design,elevensky/ant-design,zheeeng/ant-design,icaife/ant-design,elevensky/ant-design,zheeeng/ant-design