Remove area-Benchmarks

The label was renamed to tenet-performance-benchmarks

Commit migrated from dotnet/corefx@84141f9

docs/libraries/project-docs/issue-guide.md

@@ -42,7 +42,6 @@ Areas are tracked by labels area-* (e.g. area-System.Collections). Each area
 
 | Area                                                                                          | Owners / experts | Description |
 |-----------------------------------------------------------------------------------------------|------------------|-------------|
-| [area-Benchmarks](https://github.com/dotnet/corefx/labels/area-Benchmarks)                    | [@brianrob](https://github.com/brianrob), [@valenis](https://github.com/valenis) | Performance benchmarks not specific to other areas yet |
 | [area-Infrastructure](https://github.com/dotnet/corefx/labels/area-Infrastructure)            | [@weshaggard](https://github.com/weshaggard), [@ericstj](https://github.com/ericstj) | Covers:<ul><li>Packaging</li><li>Build and test infra for CoreFX repo</li><li>VS integration</li></ul><br/> |
 | [area-Meta](https://github.com/dotnet/corefx/labels/area-Meta)                                | [@tarekgh](https://github.com/tarekgh) | Issues without clear association to any specific API/contract, e.g. <ul><li>new contract proposals</li><li>cross-cutting code/test pattern changes (e.g. FxCop failures)</li><li>project-wide docs</li></ul><br/> |
 | [area-Serialization](https://github.com/dotnet/corefx/labels/area-Serialization)              | [@huanwu](https://github.com/huanwu), [@zhenlan](https://github.com/zhenlan) | Packages:<ul><li>System.Runtime.Serialization.Xml</li><li>System.Runtime.Serialization.Json</li><li>System.Private.DataContractSerialization</li><li>System.Xml.XmlSerializer</li></ul> Excluded:<ul><li>System.Runtime.Serialization.Formatters</li></ul> |