Char.IsLetter - Missing range

I have noticed that the ranges documented in this article do not contain letters like Ö, Ü, Ó, Ő, Ú, É, Á, Ű. These are being identified correctly by Char.IsLetter so I am assuming that this must be a documentation bug. It would be great if this would be corrected. Thank you!

---
#### Document Details

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

* ID: 8a971346-8a49-93b5-53c5-1c068f277bc0
* Version Independent ID: 2ec2b173-d19a-91af-3c96-aba42f708ad7
* Content: [Char.IsLetter Method (System)](https://docs.microsoft.com/en-us/dotnet/api/system.char.isletter?view=netframework-4.7.2)
* Content Source: [xml/System/Char.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System/Char.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**