Update sarracenia Docs

[franTarkenton]

Working through the examples in the sarracenia module to try to create a listener process using the MOTH extension discovered that the docs are not updated.

Leads to lots of frustration as just trying to get the demo code up and running.

Link to metpx issue:
MetPX/sarracenia#609 (comment)

If pursue also include a scan and update of any other references to the typo / change.