Update comments too

Author: JunTaoLuo

Directory.Build.props

@@ -84,8 +84,8 @@
     <RuntimeInstallerBaseName>aspnetcore-runtime</RuntimeInstallerBaseName>
     <TargetingPackInstallerBaseName>aspnetcore-targeting-pack</TargetingPackInstallerBaseName>
 
-    <!-- Produce targeting pack installers/packages once per major.minor except in extraordinary cases i.e. 3.1.2. -->
-    <!-- We can remove the 3.1.2 line from any branch other than release/3.1 and from here after 3.1.2 is released. -->
+    <!-- Produce targeting pack installers/packages once per major.minor except in extraordinary cases i.e. 3.1.3. -->
+    <!-- We can remove the 3.1.3 line from any branch other than release/3.1 and from here after 3.1.3 is released. -->
     <IsTargetingPackBuilding Condition=" '$(DotNetBuildFromSource)' == 'true' ">false</IsTargetingPackBuilding>
     <IsTargetingPackBuilding
         Condition=" '$(IsTargetingPackBuilding)' == '' AND '$(VersionPrefix)' == '3.1.3' ">true</IsTargetingPackBuilding>