Update unit testing instructions for migrating to new dotnet test (#48171)

Author: Youssef1313

docs/core/testing/unit-testing-with-dotnet-test.md

@@ -127,7 +127,6 @@ For users of MTP that are using the VSTest mode of `dotnet test`, there are few
 1. Remove `TestingPlatformDotnetTestSupport` MSBuild property, as it's no longer required.
 1. Remove `TestingPlatformCaptureOutput` and `TestingPlatformShowTestsFailure` MSBuild properties, as they are no longer used by the new `dotnet test`.
 1. Remove the extra `--`, for example `dotnet test -- --report-trx` should become `dotnet test --report-trx`.
-1. If passing a specific solution, for example, `dotnet test MySolution.sln`, this should become `dotnet test --solution MySolution.sln`.
-1. If passing a specific project, for example, `dotnet test MyProject.csproj`, this should become `dotnet test --project MyProject.csproj`.
-1. If passing a specific directory, for example, `dotnet test path/to/mydirectory`, this should become `dotnet test --directory path/to/mydirectory`
+1. If passing a specific solution (or directory containing solution), for example, `dotnet test MySolution.sln`, this should become `dotnet test --solution MySolution.sln`.
+1. If passing a specific project (or directory containing project), for example, `dotnet test MyProject.csproj`, this should become `dotnet test --project MyProject.csproj`.
 1. If passing a specific dll, for example, `dotnet test path/to/UnitTests.dll`, this should become `dotnet test --test-modules path/to/UnitTests.dll`. Note that `--test-modules` also supports globbing.