docs: add options for border prop

Author: MoveRoad

docs/docs/options.mdx

@@ -121,3 +121,4 @@ import { Tooltip } from 'react-tooltip';
 | `afterShow`        | `function`                 | no       |                           |                                                   | A function to be called after the tooltip is shown                                                                                                              |
 | `afterHide`        | `function`                 | no       |                           |                                                   | A function to be called after the tooltip is hidden                                                                                                             |
 | `middlewares`      | `Middleware[]`             | no       |                           | array of valid `floating-ui` middlewares          | Allows for advanced customization. Check the [`floating-ui` docs](https://floating-ui.com/docs/middleware) for more information                                 |
+| `border`           | `string`                   | no       |                           | a React border style                              | Change style of the tooltip border including arrows                                                                                                             |