[docs] Fix TooltipOptions section

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Yuji Sugiura 2023-05-09 21:52:02 +09:00 committed by GitHub
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@ -147,11 +147,11 @@ The X axis (often the time axis) is usually continuous. That means we can reduce
- Type: `Object`
- Default: `{}`
Customizing options for the format of the label and value displayed on hover tooltips.
#### formatTooltipX and formatTooltipY
- Type: `Function`
- Default: `undefined`
####
- Type: `function`
- Default: `{}`
Customizing options for the format of the label and value displayed on hover tooltips. This function takes a value as an argument. By default, it displays the value itself.
---