Update dotnet-test docs (#45357)

* Update dotnet-test docs

* Apply suggestions from code review

Co-authored-by: Genevieve Warren <[email protected]>

---------

Co-authored-by: Genevieve Warren <[email protected]>

Author: Youssef1313

docs/core/tools/dotnet-test.md

@@ -25,7 +25,7 @@ Some examples of the `dotnet.config` file:
   name = "VSTest"
   ```
 
-## VSTest and Microsoft Testing Platform (MTP)
+## VSTest and Microsoft.Testing.Platform (MTP)
 
 ### [dotnet test with VSTest](#tab/dotnet-test-with-vstest)
 
@@ -441,14 +441,18 @@ dotnet test -h|--help
 With Microsoft Testing Platform, `dotnet test` operates faster than with VSTest. The test-related arguments are no longer fixed, as they are tied to the registered extensions in the test project(s). Moreover, MTP supports a globbing filter when running tests. For more information, see [Microsoft.Testing.Platform](../testing/microsoft-testing-platform-intro.md).
 
 > [!WARNING]
-> `dotnet test` doesn't run in environments that have test projects using both VSTest and Microsoft Testing Platform in the same solution, as the two platforms are mutually incompatible.
+> When Microsoft.Testing.Platform is opted in via `dotnet.config`, `dotnet test` expects all test projects to use Microsoft.Testing.Platform. It is an error if any of the test projects use VSTest.
 
 #### Implicit restore
 
 [!INCLUDE[dotnet restore note](~/includes/dotnet-restore-note.md)]
 
 #### Options
 
+> [!NOTE]
+> You can use only one of the following options at a time: `--project`, `--solution`, `--directory`, or `--test-modules`. These options can't be combined.
+> In addition, when using `--test-modules`, you can't specify `--arch`, `--configuration`, `--framework`, `--os`, or `--runtime`. These options are not relevant for an already-built module.
+
 - **`--project <PROJECT_PATH>`**
 
   Specifies the path to the test project.
@@ -461,9 +465,6 @@ With Microsoft Testing Platform, `dotnet test` operates faster than with VSTest.
 
   Specifies the path to a directory that contains a project or a solution.
 
-> [!NOTE]
-> You can use only one of the following options at a time: `--project`, `--solution`, or `--directory`. These options can't be combined.
-
 - **`--test-modules <EXPRESSION>`**
 
   Filters test modules using file globbing in .NET. Only tests belonging to those test modules will run. For more information and examples on how to use file globbing in .NET, see [File globbing](../../../docs/core/extensions/file-globbing.md).
@@ -533,14 +534,17 @@ With Microsoft Testing Platform, `dotnet test` operates faster than with VSTest.
 
 - **`args`**
 
-  Specifies extra arguments to pass to the test application(s). Use a space to separate multiple arguments. For more information and examples on what to pass, see [Microsoft Testing Platform](../../../docs/core/testing/microsoft-testing-platform-intro.md) and [Microsoft.Testing.Platform extensions](../../../docs/core/testing/microsoft-testing-platform-extensions.md).
+  Specifies extra arguments to pass to the test application(s). Use a space to separate multiple arguments. For more information and examples on what to pass, see [Microsoft.Testing.Platform overview](../../../docs/core/testing/microsoft-testing-platform-intro.md) and [Microsoft.Testing.Platform extensions](../../../docs/core/testing/microsoft-testing-platform-extensions.md).
+
+  > [!TIP]
+  > To specify extra arguments for specific projects, use the `TestingPlatformCommandLineArguments` MSBuild property.
 
 > [!NOTE]
 > To enable trace logging to a file, use the environment variable `DOTNET_CLI_TEST_TRACEFILE` to provide the path to the trace file.
 
 #### Examples
 
-- Run the tests in the project in the current directory:
+- Run the tests in the project or solution in the current directory:
 
   ```dotnetcli
   dotnet test
@@ -558,7 +562,7 @@ With Microsoft Testing Platform, `dotnet test` operates faster than with VSTest.
   dotnet test --solution ./TestProjects/TestProjects.sln
   ```
 
-- Run the tests in the `TestProjects` directory:
+- Run the tests in a solution or project that can be found in the `TestProjects` directory:
 
   ```dotnetcli
   dotnet test --directory ./TestProjects