Unused parameters show underscore prefix in documentation

### Tested versions

v4.3.dev5.official

### System information

Windows 11, v4.3.dev5.official

### Issue description

When creating a virtual function in a base class, Godot creates a warning that parameters are unused and suggests prefixing them with `_`. However in the class' documentation the parameters include those underscores, which doesn't follow convention.

### Steps to reproduce

Add this function to any class:
```gdscript
func _my_virtual_function(_unused: int) -> void:
pass
```
Check the class' documentation and see the parameter is named `_unused`.

### Minimal reproduction project (MRP)

N/A

Start by reproducing the documented virtual function example in Godot v4.3.dev5.official and inspect how its class documentation renders parameter names. Confirm that unused parameters with an underscore prefix are displayed according to the project's naming convention, then verify the result with an equivalent virtual-function example.

Written by the indexing model from the issue text.