Fix docstrings

3 jobs for master in 61 minutes and 7 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #5019
amd64
job_clang_amd64

01:01:07

passed #5020
amd64
job_clang_cxx_amd64

00:29:33

passed #5018
amd64
job_gcc_amd64

00:47:49