Update index.en-US.md (#26476)
Update index.en-US.md (#26476)

Type for Checkbox.Group Options is not valid on docs.
ant-design/ant-design,elevensky/ant-design,ant-design/ant-design,zheeeng/ant-design,ant-design/ant-design,elevensky/ant-design,zheeeng/ant-design,elevensky/ant-design,zheeeng/ant-design,icaife/ant-design,icaife/ant-design,icaife/ant-design,icaife/ant-design,zheeeng/ant-design,ant-design/ant-design,elevensky/ant-design