### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

v4.1.1.stable.official [bd6af8e0e]

### Issue description

In-script documentation (`##`) for `signal` members is not appearing in the _Node_ tab as expected.  Other documentation appears to work correctly in the _Inspector_ tab.

Working example (exported variable):
![GodotDocumentationWorking](https://github.com/godotengine/godot/assets/13528480/ab9b19d4-c9f7-4658-8379-f2c2699310b8)

Non-working example (`signal`)
![GodotDocumentationNotWorking](https://github.com/godotengine/godot/assets/13528480/06824f6a-b135-4454-a06e-7c6feb34060b)

I have tried deselecting and reselecting the associated Node, changing between the tabs on the left pane, changing active scripts and even restarting Godot - nothing makes it work.  According to the [GScript Documentation on Documentation Comments](https://docs.godotengine.org/en/stable/tutorials/scripting/gdscript/gdscript_documentation_comments.html), this **should** work, right?  Or is there something completely obvious that I am missing?


### Steps to reproduce

1. In Godot, create a new Node of type `Node`
2. Attach a new script to this Node, accepting all current defaults
3. In the script editor create a `signal` called `Foo` and right above it, create a `##` comment for it
4. Also create an `@export`ed integer variable called `Bar` and also create a `##` comment for it
5. Unselect and reselect the Node in the _Scene_ tab to refresh the _Inspector_ and _Node_ tabs
6. Hover over the variable in the _Inspector_ tab and see that the added description is shown correctly
7. Hover over the signal in the _Node_ tab and see that the added description is **not** shown and "_No description._" is shown instead

This is an example of the script that could be added:
```
## This is signal foo!
signal Foo

## This is exported signal bar!
@export var Bar : int = 0
```

### Minimal reproduction project

N/A
}
	MethodInfo signal_info;
	if (compatible_methods_only->is_pressed()) {
		List<MethodInfo> signals;
		source->get_signal_list(&signals);
		for (const MethodInfo &mi : signals) {
			if (mi.name == signal) {
				signal_info = mi;
				break;
			}
		}
	}
	TreeItem *root_item = method_tree->create_item();
	root_item->set_text(0, TTR("Methods"));
	root_item->set_selectable(0, false);
	
	ScriptInstance *si = target->get_script_instance();
	if (si) {
		if (si->get_script()->is_built_in()) {
			si->get_script()->reload();
		}
		List<MethodInfo> methods;
		si->get_method_list(&methods);
		methods = _filter_method_list(methods, signal_info, search_string);
		if (!methods.is_empty()) {
			TreeItem *si_item = method_tree->create_item(root_item);
			si_item->set_text(0, TTR("Attached Script"));
			si_item->set_icon(0, get_theme_icon(SNAME("Script"), SNAME("EditorIcons")));
			si_item->set_selectable(0, false);
			_create_method_tree_items(methods, si_item);