Corrects "Cards and Atoms" demo code sample
Corrects "Cards and Atoms" demo code sample

Drops the opening `<figure>` to the next line and fixes a typo by changing the closing tag from `</figura>` to `</figure>`
bustle/mobiledoc-kit,mixonic/content-kit-editor,mixonic/content-kit-editor,YoranBrondsema/mobiledoc-kit,bustlelabs/mobiledoc-kit,Hstry/mobiledoc-kit,bustlelabs/content-kit-editor,bustlelabs/content-kit-editor,Hstry/mobiledoc-kit,bustlelabs/mobiledoc-kit,Hstry/mobiledoc-kit,bustlelabs/mobiledoc-kit,YoranBrondsema/mobiledoc-kit,YoranBrondsema/mobiledoc-kit,bustlelabs/content-kit-editor,bustle/mobiledoc-kit,bustle/mobiledoc-kit,mixonic/content-kit-editor,bustle/mobiledoc-kit