@see annotaton duplicates documentation when using with @class

還沒有人認領這個 Issue。

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

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Annotations

### Expected Behaviour

I'm trying to add some `@see` tags to my `@class`

### Actual Behaviour

When hovering class in editor, displayed documentation is printed twice.

### Reproduction steps

Here is basic code sample. Hovering or typing `class1` causes issue with displayed documentation
```lua
--- some class dock
---
---@class C2
local class2 = {}

--- another class dock here
---
---@see C2
---@class C1
local class1 = {}

---@type C1
local class1_instance = class1
```

從 issue 中提供的 Lua 重現開始，比較 C1 在有和沒有 @see C2 註解時的 hover 結果。由於沒有指定 repository 檔案或測試，因此請定位 language server 使用的註解與類別文件處理邏輯，然後驗證 C1 的文件只顯示一次，同時 @see 參照仍然可用。

由索引模型根據 Issue 內容生成。