The first document in a case is not always a complaint, so don't say it is

[mlissner]

This parallels the annoying tweaks we've been making to the "Initial Complaint" button in search results:

freelawproject/courtlistener#4324

The bot currently says "Complaint" for all case types. It should be changed to say "Initial Doc:" instead, so that it's always correct.

A user complained (ha!) about this on Twitter yesterday:

https://x.com/beyondreasdoubt/status/1831566577067585642