fix the types in the docstrings

3 jobs for mk-aqua in 8 minutes and 6 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test Basic
passed docker:v1.6 #304025

00:05:11

passed format #304024
privileged

00:02:04

 
  Documentation
passed doc-tests:v1.6 #304026

00:02:54