Document some parameters for JSON.writeJSON

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 49%. Comparing base (39f96ec) to head (a646235). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1922 +/- ## ======================================= Coverage 49% 49% - Complexity 6161 6163 +2 ======================================= Files 661 661 Lines 58698 58701 +3 Branches 8547 8548 +1 ======================================= + Hits 28958 28962 +4 - Misses 27549 27551 +2 + Partials 2191 2188 -3 ```

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[jurgenvinju]

Thanks @linuswagner