[docs] Add conditional label formatting on tooltip page and link to l…

…abel page (#13235)

Signed-off-by: Jose C Quintas Jr <juniorquintas@gmail.com>
Co-authored-by: Lukas <llukas.tyla@gmail.com>

docs/data/charts/tooltip/tooltip.md

@@ -90,6 +90,26 @@ In this demo, you can see:
 
 {{"demo": "AxisFormatter.js"}}
 
+### Label formatting
+
+The label text inside the tooltip can also be formatted conditionally by providing a function to the series `label` property.
+
+```jsx
+<LineChart
+  // ...
+  series={[
+    {
+      data: [ ... ],
+      label: (location) => location === 'tooltip' ? 'BR' : 'Brazil'
+    }
+  ]}
+/>
+```
+
+:::info
+See [Label—Conditional formatting](/x/react-charts/label/#conditional-formatting) for more details.
+:::
+
 ### Hiding values
 
 You can hide the axis value with `hideTooltip` in the `xAxis` props.