Operators are not included in the output when generating documentation via the --doc CLI argument

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

Command Line

### Which OS are you using?

Linux

### What is the issue affecting?

Annotations, Other

### Expected Behaviour

When generating markdown and JSON documentation via the command line argument `--doc`, the output files should contain operators defined by the `@operator` syntax.

### Actual Behaviour

The expected behavior is that the operators are missing in both the markdown and JSON generated files.

### Reproduction steps

Given the following Lua file:

```lua
---@meta

---@class Vector2f
---@operator unm:Vector2f
---@operator add(Vector2f | number):Vector2f
---@operator sub(Vector2f | number):Vector2f
Vector2f = {}
```

When the language server is run with the following args:

```
./LuaS/bin/lua-language-server --doc=./example.lua --doc_out_path=.
```

Then the output `doc.md` and `doc.json` do not contain any of the operators specified.

In the `doc.json` the type `Vector2d` is the following, notice the lack of any operators:

```json
{
"defines": [
{
"async": false,
"deprecated": false,
"file": ".",
"finish": [
2,
18
],
"start": [
2,
10
],
"type": "doc.class",
"view": "Vector2f",
"visible": "public"
}
],
"fields": [],
"name": "Vector2f",
"type": "type",
"view": "Vector2f"
}
```

### Additional Notes

_No response_

### Log File

_No response_

Start at the `--doc` CLI entry point and trace how the example.lua input is converted into `doc.md` and `doc.json`. Reproduce the issue with the supplied Vector2f example, then verify that both generated files include the `@operator` definitions.

Written by the indexing model from the issue text.