adds item markdown code block

[katshun0307]

```ocaml
# x;;
val - = 100
# let x = 3 in x + 2;;
val - = 5

In a markdown code block like the above example, x;; and let x = 3 in x + 2;; is added to the outline , maybe because it starts with a #. Since it is a code block, I think this is unintended behavior.

[patrys]

This extension does not do any parsing, please report this to the Markdown extension (which I think is part of VS Code?).

[katshun0307]

Sorry, I'm not familiar about the components of VSCode, nor can I read/write typescript. I have no clue how to describe this. If you could, would you mind reporting it?