docs(data-a11y): added external link

Author: krisantrobus

packages/paste-website/src/pages/foundations/data-visualization/for-engineers/accessibility.mdx

@@ -58,7 +58,7 @@ export const getStaticProps = async () => {
   </Callout>
 </Box>
 
-Highcharts offers an accessibility module which we recommend always enabling. If using our [BaseChart](foundations/data-visualization/for-engineers#basechart) implementation this is taken care of. It provides many useful features that help visually impaired users interact and understand charts. Features that are offered are:
+Highcharts offers an accessibility module which we recommend always enabling. If using our [BaseChart](foundations/data-visualization/for-engineers#basechart) implementation this is taken care of. It provides many useful features that help visually impaired users interact and understand charts. More information on this module can be found [here](https://www.highcharts.com/docs/accessibility/accessibility-module). Features that are offered are:
 - Announces chart meta data such as title, subtitle, and description.
 - Allows keyboard navigation of series, points and legend items.
 - Describes series when focused.