From the conversation at #359 (comment), we found that markdown tables use a mixture of styles. This issue concerns unifying them into a single style.

For example:

| Heading1 | Heading2 |
| --- | --- |
| Column1 with some text | |

vs:

| Heading1               | Heading2 |
| ---------------------- | -------- |
| Column1 with some text |          |

Personally I prefer the former, because there's no need to maintain the layout when content changes, which reduces the diff and makes review easier. But it also depends on the tooling used by the team to decide what works best.