Updating @package and @subpackage doc tags

I got annoyed with the fact that this page exists: http://api.silverstripe.org/3.1/package-None.html

So the next time docs are updated, it should disappear :)

There are no actual code changes in here, and the biggest change (to SSTemplateParser.php and SSTemplateParser.php.inc) is only to fix the comment spacing, the actual wording doesn't change.