Update merge routes

- fixes incorrect information about merge tag sets resource
- fixes incorrect information about merge tags resource
- adds support for embedding code examples in request docs
might be nice to add an example here with param values:
    curl -s -q http://api.ingeniapi.com/v2/tag_sets?api_key=$api_key&limit=100&offset=100&bundle_id=$bundle_id&updated_since=<time string>