Documentation issue

[Andrey N]

Hello guys,

I've found that the current wiki doesn't describe such important topic 
as Purging information. There is only a mention about this functionality 
in Complete HTTP API Reference 
<http://wiki.apache.org/couchdb/Complete_HTTP_API_Reference>. Please add 
me in ContributorsGroup and I'll add article that describes how to purge 
deleted documents and in what case.

P.S. In couchbase there is documentation about it 
<http://www.couchbase.org/sites/default/files/uploads/all/documentation/couchbase-api-db.html#couchbase-api-db_db-purge_post>.

Thanks.