Fix JSON consistency in api.json

[charphi]

Alias type should be and array and not a string.

[codecov[bot]]

Codecov Report

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

Comparison is base (31e5795) 89.80% compared to head (a365ff1) 89.80%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #277 +/- ## ======================================= Coverage 89.80% 89.80% ======================================= Files 32 32 Lines 1825 1825 ======================================= Hits 1639 1639 Misses 186 186 ```

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[MansMeg]

Thanks!