### Documentation for custom series `renderItem` is missing any mention of how
to apply styling set in `series[i].emphasis`.
All examples in the documentation show application of `style: api.style()` in
`renderItem`, but that doesn't do anything about `emphasis`. After catching the
`api` in runtime and examining its contract, I found that it also provides a
`styleEmphasis` method and that I can set the returned object's `styleEmphasis`
to control its emphasis styling.
### Version & Environment [版本及环境]
_Irrelevant._
### Expected behaviour [期望结果]
Documentation for custom series' `renderItem` should clearly describe how to
apply emphasis styling.
### ECharts option
```javascript
option = {
// ...
series: [{
type: 'custom',
itemStyle: {
color: 'red'
},
emphasis: {
itemStyle: {
color: 'cyan'
}
},
renderItem(params, api) {
// ...
return {
// ...,
style: api.style(), // the documentation shows this ...
styleEmphasis: api.styleEmphasis() // ... but never mentions this
}
},
// ...
}]
}
```
[ Full content available at:
https://github.com/apache/incubator-echarts/issues/8941 ]
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