completion not work after a line comment at tail

還沒有人認領這個 Issue。

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

NeoVim

### Which OS are you using?

MacOS

### What is the issue affecting?

Completion

### Expected Behaviour

```
obj
:test() -- some comment
:test()
```

the second `test()` should complete as expected

### Actual Behaviour

the second `test()` can not complete

### Reproduction steps

the test lua code:

``` lua
---@meta test

---@class Test
---@overload fun():Test
Test = {}
---@return Test
function Test:test() end

local obj = Test()
obj
:test()
:test() -- comment
:test()
```

### Additional Notes

_No response_

### Log File

_No response_

使用 issue 中的 Lua 程式碼在 NeoVim 中重現 completion 失敗，尤其要關注帶有尾隨行註解的鏈式呼叫。追蹤註解行之後第二次呼叫的 completion 路徑，並將其與預期行為進行比較。當該呼叫的 completion 正常運作，同時保留現有的註解處理方式時，即表示完成。

由索引模型根據 Issue 內容生成。