Merge branch 'fix-true-documentation' into 'master'

change HELP.md to tell the user about the correct encoding of True.

See merge request mlubbers/ssm!3
2 jobs for master in 26 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #115797
build

00:00:26

passed #99510
build

00:00:34