Add support for markdown tables in pattern documentation

[JosefBredereck]

Expected Behavior

For this documentation, the renderer should render a table in the pattern documentation.

|    Size     |  CSS Class   |
| :---------: | :----------: |
| Extra-Small | `button--xs` |
|    Small    | `button--sm` |
|   Medium    | `button--md` |
|    Large    | `button--lg` |
| Extra-Large | `button--xl` |

Actual Behavior

Table is not rendered as table.

[JosefBredereck]

The issue was released with v5.13.0 🎉