Abstract functions will have comments when they are completed during inheritance

### Tested versions

v4.5.stable.official [876b29033]

### System information

Godot v4.5.stable - Windows 10 (build 19045) - Multi-window, 2 monitors - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 with Max-Q Design (NVIDIA; 31.0.15.1700) - AMD Ryzen 7 4800H with Radeon Graphics (16 threads) - 23.37 GiB memory

### Issue description

I created a class using abstract class keywords and added some abstract functions, then wrote comments for the functions. When I implemented the inheritance class of this class, I found that when completing abstract methods, I would insert the comments of the next function as completion content into the code.

### Steps to reproduce

StateBase.gd
``` gdscript
## StateBase
@abstract
class_name StateBase
extends Node

var state_machine: StateMachine

## enter state
func enter() -> void:
pass

## exit state
@abstract func exit() -> void

@abstract func process_update(delta: float) -> void

## every physics process
@abstract func physical_process_update(delta: float) -> void

```

Another code file:
``` gdscript
extends StateBase

func pr
```
At this point, a completion prompt will appear with comments for the parent class declaration file.

If it is the `enter` method, it will not trigger the problem as it is not an abstract method.
If it is the `exit` method, the absence of comments in the next function `process_update` will not trigger an issue.

### Minimal reproduction project (MRP)

[godot-test-4.5.zip](https://github.com/user-attachments/files/22359960/godot-test-4.5.zip)

Start with the attached godot-test-4.5.zip reproduction, then compare StateBase.gd with the derived code file where `func pr` triggers completion. Reproduce the abstract-method suggestions for `exit`, `process_update`, and `physical_process_update`; done means completing an abstract method no longer inserts comments from the following parent function.

Written by the indexing model from the issue text.