doc/howto_release.txt: wingrass cronjob added

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@74329 15284696-431f-4ddb-bdfa-cd5b030d7da7

doc/howto_release.txt

@@ -179,6 +179,7 @@ ssh neteler@$SERVER1 "cd $SERVER1DIR ; ln -s grass-$VERSION.tar.gz grass-$MAJOR.
 vim grass-addons/tools/wingrass-packager/grass_packager_release.bat
 vim grass-addons/tools/wingrass-packager/grass_addons.sh
 vim grass-addons/tools/wingrass-packager/grass_copy_wwwroot.sh
+vim grass-addons/tools/wingrass-packager/cronjob.sh             # major/minor release only
 
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 # update web site to new version: CMS