APIv4 - Code cleanup & improve links to @see annotations in Explorer

[colemanw]

Overview

Minor code cleanup in a few APIv4 classes, and improve rendering of links to @see annoations in the APIv4 explorer help panel.

Before/After

Links for e.g. Permission::get in the APIv4 explorer were not correct (the ones at the bottom under See:). Now they are at least more correct.

[civibot]

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[eileenmcnaughton]

What is the reason for these removals?

[eileenmcnaughton]

This does what it says on the box - I just had the one question about the removed 'required' lines

[eileenmcnaughton]

Hmm I hammered the UI a bit more on the 'before' & I can see that the required fields are which fields are 'required' don't actually make that much sense for the get action and don't seem to be enforced anywhere so I guess that's why - merging

[colemanw]

Thanks @eileenmcnaughton.
That's right, required is only enforced for Create. For other actions it's meaningless.