nitdoc: show introduced mpropdef outside intro mclassdef

Fixes #445

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
nitdoc: fix concerns list display

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
Merge: Fix nitdoc

Fixes #445 and concerns list display

Pull-Request: #447
Reviewed-by: Jean Privat <jean@pryen.org>