added missing slash form closing xml tag in code comment (#509)

fixed a typo where there was closing xml `</TestTimeout>` written as `<TestTimeout>`

Author: Steinblock

src/Adapter/MSTest.CoreAdapter/MSTestSettings.cs

@@ -281,7 +281,7 @@ private static MSTestSettings ToSettings(XmlReader reader)
             //     <CaptureTraceOutput>true</CaptureTraceOutput>
             //     <MapInconclusiveToFailed>false</MapInconclusiveToFailed>
             //     <EnableBaseClassTestMethodsFromOtherAssemblies>false</EnableBaseClassTestMethodsFromOtherAssemblies>
-            //     <TestTimeout>5000<TestTimeout>
+            //     <TestTimeout>5000</TestTimeout>
             //     <Parallelize>
             //        <Workers>4</Workers>
             //        <Scope>TestClass</Scope>