Fix docstrings

12 jobs for instance_helpers in 13 minutes and 39 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build Docker
passed #1186291
build_docker_from_cache

00:00:14

 
  Test
passed #1186293
test_mpi

00:00:16

passed #1186292
test_serial

00:05:31

86.0%
 
  Demo Runs
passed #1186300
run_bernoulli

00:00:29

passed #1186301
run_curve_fitting

00:00:28

passed #1186296
run_getting_started_1

00:00:33

passed #1186297
run_getting_started_2

00:00:59

passed #1186298
run_getting_started_3

00:02:12

passed #1186299
run_getting_started_mf

00:07:53

passed #1186294
run_ipynb0

00:01:33

passed #1186295
run_ipynb1

00:00:42

passed #1186302
run_visual_mgvi

00:01:21