Document codefix limitations about "non-local" diagnostics

See https://github.com/dotnet/roslyn/issues/57621

---
#### Document Details

⚠ *Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.*

* ID: 6e3fc905-7aa1-7f5e-9bfe-fbcef461ad5e
* Version Independent ID: a286e20b-1e43-dc57-e0fb-5a9dee7ec3f6
* Content: [Tutorial: Write your first analyzer and code fix](https://docs.microsoft.com/en-us/dotnet/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix)
* Content Source: [docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix.md](https://github.com/dotnet/docs/blob/main/docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix.md)
* Product: **dotnet-csharp**
* Technology: **csharp-roslyn**
* GitHub Login: @BillWagner
* Microsoft Alias: **wiwagn**

Start with docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix.md and read the linked Roslyn issue 57621 for the relevant limitation. Update the tutorial to explain the code fix limitations around non-local diagnostics, then verify the documentation accurately reflects the linked issue and renders correctly.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.