"add-multiple ⮐" Hint is Missing From Array Fields

[marshallwp]

This was previously touched on as part of issue #397, but was never addressed. To wit, and as seen in the screenshots below, starting with RapiDoc v8.4.0, array fields no longer display the hint that you can add multiple values by pressing enter after each one.

In the past I've been told by several people that figuring out how to enter multiple values into an array field in RapiDoc is the most confusing usability issue of the software. The hint mitigated this with instructions, but with it gone I cannot see anyway for newcomers to know how to input an array of values.