better comment

Author: VSadov

src/tests/async/Directory.Build.targets

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <!-- Disable runtime async testing in main repo by default. Uncomment the following to enable. -->
+    <!-- Disable runtime async testing in main repo by default. Remove the following to enable. -->
     <!--<DisableProjectBuild>true</DisableProjectBuild>-->
   </PropertyGroup>