AST-1579 Fix modelnextsteps docs

Maik Nijhuisrequested to merge
ast-1579-duplicate-modelnextsteps into master

After seeing two "modelnextsteps" section in the DDECal documentation, I found that the second one actually has an (invisible) <direction> suffix...

After a few attempts, I found a way to properly generate the documentation. See the readthedocs output.

Edited by Maik Nijhuis

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