Reword instructions for running tests on Visual Studio.

Suggested by Maël Hörz.

llvm-svn: 129237
diff --git a/llvm/docs/GettingStartedVS.html b/llvm/docs/GettingStartedVS.html
index 49d10b4..113ba49 100644
--- a/llvm/docs/GettingStartedVS.html
+++ b/llvm/docs/GettingStartedVS.html
@@ -194,7 +194,9 @@
   <ul>
     <li>If %PATH% does not contain GnuWin32, you may specify LLVM_LIT_TOOLS_DIR
     on CMake for the path to GnuWin32.</li>
-    <li>You can run LLVM tests to build the project "check".</li>
+    <li>You can run LLVM tests by merely building the project
+      "check". The test results will be shown in the VS output
+      window.</li>
   </ul>
   </li>