Missing 'z' property in GridLineOptions

[KarolDunajski]

Documentation Is:

• Missing or needed
• Confusing
• Not Sure?

Please Explain in Detail...

It lack of one property z: number in GridLineOptions - https://www.chartjs.org/docs/latest/api/interfaces/GridLineOptions.html

I could find z property in https://www.chartjs.org/docs/latest/axes/styling.html

also it is use in the code

Chart.js/src/core/core.scale.js

Line 1623 in 259f8e8

const gz = valueOrDefault(opts.grid && opts.grid.z, -1);

but it is missing in api docs

Your Proposal for Changes

Please add it to api docs

Example

[kurkle]

The api docs are generated from typings, so it is missing from the type definitions. We'd be happy to have a PR for this, if you are able.