Markdown numbers not displaying correctly

[amyrlam]

Relates to: #3793

Maybe we fix this on https://github.com/ember-learn/ember-blog instead?

Current Behavior

Expected Behavior

Numbers should display as 1. and 2. as typed

Steps to Reproduce

1. Visit https://emberjs.com/blog/2019/01/26/emberjs-native-class-update-2019-edition.html#toc_when-it-s-ok-to-use-code-extend-code or https://github.com/emberjs/website/blob/master/source/blog/2019-01-26-emberjs-native-class-update-2019-edition.md#when-its-ok-to-use-extend (go to raw)