fix the types in the docstrings

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

00:05:11

passed #304024
privileged
format

00:02:04

 
  Documentation
passed #304026
doc-tests:v1.6

00:02:54