Merge branch '41-improve-doc-of-prepgr-concerning-gr5h' into 'dev'

Resolve "Improve doc of PrepGR concerning GR5H"

Closes #41

See merge request !18
1 job for 43-allow-to-simulate-a-subperiod-without-discharge-in-simgr in 1 minute and 53 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Check
passed check_as_cran_patched #191609

00:01:53