docs(radio-group): link value to Value Key title

docs/content/3.components/radio-group.md

@@ -40,7 +40,7 @@ You can also pass an array of objects with the following properties:
 
 - `label?: string`{lang="ts-type"}
 - `description?: string`{lang="ts-type"}
-- `value?: string`{lang="ts-type"}
+- [`value?: string`{lang="ts-type"}](#value-key)
 - `disabled?: boolean`{lang="ts-type"}
 
 ::component-code
@@ -70,6 +70,8 @@ props:
 When using objects, you need to reference the `value` property of the object in the `v-model` directive or the `default-value` prop.
 ::
 
+#### Value Key
+
 You can change the property that is used to set the value by using the `value-key` prop.
 
 ::component-code