Irritating Markdown syntax for headings conflicts with traditional comment frames in Lua

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### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Linux

### What is the issue affecting?

Annotations

### Expected Behaviour

"Hello World!" in the following annotation is NOT treated as a heading:
```
--------------------------------------------------------------------------------
--- Hello World!
--------------------------------------------------------------------------------
local function Main() end
```

### Actual Behaviour

"Hello World!" shows as a heading in the documentation pop-up window like so.

### Reproduction steps

Type the following code and hover your mouse over the function name.
```
--------------------------------------------------------------------------------
--- Hello World!
--------------------------------------------------------------------------------
local function Main() end
```

### Additional Notes

As someone who likes to frame documentation comments, I find this issue unbearable. The reason we should except Markdown's dash `----` syntax for headings in LuaCATS is because Lua uses dashes to delimit the comments themselves. And those who frame comments also use the same character (dash) for the rest of the frame. You wouldn't use another character for the frame, it would look ugly and not uniform. For example, in C, Markdown's heading syntax does not conflict with the comment delimiter (`//`). So you can frame your comments by repeating the comment delimiter itself for a uniform frame.

### Log File

Log files have no use in this issue.

Reproduisez le problème dans l’extension Visual Studio Code en survolant la fonction de l’annotation Lua encadrée présentée dans le rapport. Commencez par localiser la gestion des titres Markdown de LuaCATS utilisée pour la documentation des annotations, puis vérifiez que le texte encadré « Hello World! » n’est plus rendu comme un titre, tandis que les titres Markdown ordinaires fonctionnent toujours.

Rédigé par le modèle d'indexation à partir du texte de l'issue.