Removed the mention of DataTestMethod attribute (#26233)

* Removing mention of DataTestMethod attribute

* Update PrimeService_IsPrimeShould.cs

Author: Haplois

docs/core/testing/snippets/unit-testing-using-mstest/csharp/PrimeService.Tests/PrimeService_IsPrimeShould.cs

@@ -22,7 +22,7 @@ public void IsPrime_InputIs1_ReturnFalse()
         }
 
         #region Sample_TestCode
-        [DataTestMethod]
+        [TestMethod]
         [DataRow(-1)]
         [DataRow(0)]
         [DataRow(1)]

docs/core/testing/unit-testing-with-mstest.md

@@ -153,7 +153,7 @@ In the *unit-testing-using-mstest* directory, run `dotnet test` again. The `dotn
 
 ## Add more features
 
-Now that you've made one test pass, it's time to write more. There are a few other simple cases for prime numbers: 0, -1. You could add new tests with the [TestMethod attribute](xref:Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute), but that quickly becomes tedious. There are other MSTest attributes that enable you to write a suite of similar tests.  A [DataTestMethod attribute](xref:Microsoft.VisualStudio.TestTools.UnitTesting.DataTestMethodAttribute) represents a suite of tests that execute the same code but have different input arguments. You can use the [DataRow attribute](xref:Microsoft.VisualStudio.TestTools.UnitTesting.DataRowAttribute) to specify values for those inputs.
+Now that you've made one test pass, it's time to write more. There are a few other simple cases for prime numbers: 0, -1. You could add new tests with the [TestMethod attribute](xref:Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute), but that quickly becomes tedious. There are other MSTest attributes that enable you to write a suite of similar tests. A test method can execute the same code but have different input arguments. You can use the [DataRow attribute](xref:Microsoft.VisualStudio.TestTools.UnitTesting.DataRowAttribute) to specify values for those inputs.
 
 Instead of creating new tests, apply these two attributes to create a single data driven test. The data driven test is a method that tests several values less than two, which is the lowest prime number. Add a new test method in *PrimeService_IsPrimeShould.cs*: