[docs] [issue9101] reference json format in file formats chapter

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

1: Agreed.

2: Would use wording like: "The json module can also be used for this purpose." Can be used does not imply that it is its main function but it hints in the right direction.

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nosy: +lukasz.langa

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