test: allow help without descriptions

Author: marko1olo

src/System.CommandLine.Tests/Utility/AssertionExtensions.cs

@@ -47,8 +47,8 @@ public static AndConstraint<StringCollectionAssertions<IEnumerable<string>>> BeE
     }
 
     public static AndConstraint<StringAssertions> ShowHelp(this StringAssertions output) => 
-        output.Subject.Should().Match("*Description:*Usage:*");
+        output.Subject.Should().Contain("Usage:");
 
     public static AndConstraint<StringAssertions> NotShowHelp(this StringAssertions output) => 
-        output.Subject.Should().NotMatch("*Description:*Usage:*");
-}
+        output.Subject.Should().NotContain("Usage:");
+}