Update issue-guide.md

Author: tarekgh

Documentation/project-docs/issue-guide.md

@@ -91,7 +91,7 @@ Areas are tracked by labels area-* (e.g. area-System.Collections). Each area
 | [System.ServiceProcess](https://github.com/dotnet/corefx/labels/area-System.ServiceProcess)   | **[@maryamariyan](https://github.com/maryamariyan)**, [@Anipik](https://github.com/Anipik) |  |
 | [System.Text.Encoding](https://github.com/dotnet/corefx/labels/area-System.Text.Encoding)     | **[@krwq](https://github.com/krwq)**, [@tarekgh](https://github.com/tarekgh) | Included:<ul><li>System.Text.Encoding**s**.Web</li></ul> |
 | [System.Text.RegularExpressions](https://github.com/dotnet/corefx/labels/area-System.Text.RegularExpressions) | **[@ViktorHofer](https://github.com/ViktorHofer)**, [@Priya91](https://github.com/Priya91) |  |
-| [System.Threading](https://github.com/dotnet/corefx/labels/area-System.Threading)             | **[@kouvel](https://github.com/kouvel)**, [@tarekgh](https://github.com/tarekgh) |  |
+| [System.Threading](https://github.com/dotnet/corefx/labels/area-System.Threading)             | **[@kouvel](https://github.com/kouvel)**|  |
 | [System.Transactions](https://github.com/dotnet/corefx/labels/area-System.Transactions)       | [@jimcarley](https://github.com/jimcarley), [@qizhanMS](https://github.com/qizhanMS), [@dmetzgar](https://github.com/dmetzgar) |  |
 | [System.Xml](https://github.com/dotnet/corefx/labels/area-System.Xml)                         | **[@krwq](https://github.com/krwq)**, [@pjanotti](https://github.com/pjanotti) |  |
 | **Microsoft contract assemblies** | | |