In-app documentation sample updates

[Misjohns]

We should provide a sample on the in-app documentation section that shows how a user launches the drawer. In the main window of the UI there will be a "Learn more" link followed by the pf-icon-open-drawer-right icon. When user clicks this link the in-app doc drawer opens. This icon helps the user know they will not be leaving the page and that the additional content will appear in a drawer of their current window.

We should also include this icon after each link on the sample list here for consistency.