Merge branch 'ralf/discrete' into 'master'

fix typo in -d> docs

See merge request !298
6 jobs for master in 19 minutes and 48 seconds (queued for 4 minutes and 46 seconds)
Status Name Job ID Coverage
  Build
passed build-coq.8.10.dev #38986
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passed build-coq.8.7.2 #38990
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passed build-coq.8.8.2 #38989
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passed build-coq.8.9.0 #38988
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passed build-coq.8.9.1 #38987
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passed build-coq.dev #38985
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