[Bug] Video Markdown syntax not usable?

**Describe the bug**
A clear and concise description of what the bug is.

Attempting to use the documentation shown Markdown for Video:

```
> [!Video https://youtu.be/someValidLink]
```
Dies not render as video like shown in the docs

Only using markdigExtensions medialinks does work for this but with its own syntax

**To Reproduce**
Steps to reproduce the behavior:
1. Use the syntax from above taken from the docs here and point to an YouTube video
2. Build and serve

**Expected behavior**
A clear and concise description of what you expected to happen.

**Context (please complete the following information):**
- OS: Windows 11
- Docfx version: 2.78.3+850a61c2ecb83b0bda21448f1393e480934556fd

**Additional context**
Add any other context about the problem here.

Will add link to my Repo branch if needed but there I did already switch to medialinks to make it work properly.