Add custom JSDoc "expects" tag

[christianechevarria]

Is your feature request related to a problem? Please describe.
Minimized code will have implicit assumptions baked into it. Ideally no assumptions would ever be made but this would create repeated work. So it's desirable to trust that arguments will conform to certain standards e.g. an array is sorted or a property is set

Describe the solution you'd like
As a way to make assumptions built into code explicit we could add a custom JSDoc @assumption that would go above the function declaration and render in the docs for a end-user consuming the software

Edit: As a way to shorten the syntax and broaden the applicability of the tag we could use @expects for interface related assumptions

[christianechevarria]

The code for this is already present within the JSDoc template files as support was added for @alpha and @beta tags in ef21b99 and we could use the same method to resolve this issue