Fix typo

Author: jeanbisutti

.github/CONTRIBUTING.md

@@ -43,7 +43,7 @@ See also our [GitHub Workflows](/.github/workflows) for examples of building the
 
 ## Testing
 
-Unit tests can be run in either the Visual Studio Test Exploror or via .NET CLI `dotnet test` ([link](https://docs.microsoft.com/dotnet/core/tools/dotnet-test)).
+Unit tests can be run in either the Visual Studio Test Explorer or via .NET CLI `dotnet test` ([link](https://docs.microsoft.com/dotnet/core/tools/dotnet-test)).
 
 This repo also has some Integration Tests which cannot be run as a standalone DLL and must be run in the context of their project (*.csproj).
 For more information please visit [Integration tests in ASP.NET Core](https://docs.microsoft.com/aspnet/core/test/integration-tests).