[1847] Fix export of abstract OccurrenceUsage

[adaussy]

Bug: #1847

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[AxelRICHARD]

You can't round the first abstract with '_' and the second one with '"'.
You have to choose one and be consistent.
Here, you can just probably write:
Fix the textual export of OccurrenceUsage to avoid duplication of the abstract keyword.

[AxelRICHARD]

You also have to put two '**' instead of one.

[adaussy]

Regarding the abstract. In my mind it was not the same. The first one is the feature so I used _ and the second one is the keyword found in the text file. But ok.

[AxelRICHARD]

you forgot the choose '_' or '"' for abstract