These are templates as used by Wikipedia for auto categorising articles that required editing for various reasons, see http://en.wikipedia.org/wiki/Wikipedia:Template_messages for full information.

Current available ones are
{{expand}}
{{expand-section}}
{{update}}

I may add Merge / split at some point.
Adding these to a page will auto add that page to one of the following categories;
Category:Articles to be expanded
Category:All articles to be expanded
Category:Articles in need of updating