You may know about how to load files into your iex. Right?
c "my-module.exs"
If you actively work on it, and want to reload it, that you can also do this:
r MyModule
Also, note that, not according to the docs, the file where this module is defined will recompiled, but only in memory. So maybe some typespecs and doc may then be outdated, since they are never loaded into memory.