Numbered list not visible + not suitable in zen.mdx

[jorge-campo]

The numbered list at the end of zen.mdx is not visible. This list works better as an unordered list, as it doesn't describe a set of actions but a list of things.

What does this PR do?

Small fix at the end of the zen.mdx documentation file, where an invisible ordered list is replaced by an unordered one.

How did you verify your code works?

No code is involved; just a markup update to one OpenCode document.