As discussed in issue #2883, based on work in issue #2388, I would like to split the TXN and SSN plugin argument index reservations. Currently nothing in the TS code base uses SSN plugin args therefore this change will not affect any example, production, or experimental plugin provided by the code base.
Attached is the updated man page based on this change. I have a branch, https://github.com/solidwallofcode/trafficserver/tree/i-2883 , which has the code changes on it.