AEM supports README.md files inside components which will render the README.md files on the component detail page: http://localhost:4502/libs/wcm/core/content/sites/components.html
This Jetpack tool re-uses some part of this component to render README.md files which are not stored in a component.
To link from another readme to this readme, use the following markdown syntax:
[Example Documentation](/apps/jetpack/documentation/content/details.html/apps/jetpack/documentation/example)