Fix docstring parameters explanation of searches and se_searches

Here, and generally in search.py, the defintions of searches and se_searches are reversed:

https://git.ligo.org/lscsoft/raven/-/blob/master/ligo/raven/search.py#L68-71

changed milestone to %ligo-raven 3.2

added documentation label

assigned to @naresh.adhikari

changed milestone to %ligo-raven 3.1

This has been fixed by !92 (merged)

closed