Unclear documentation of FITS_rec

At https://github.com/astropy/astropy/blob/master/astropy/io/fits/fitsrec.py#L167
it was said "It inherits all of the standard methods from `numpy.ndarray`".

Could you be more specific which of these methods can be applicable to a FITS_rec object?

As indicated in #4233 , at least the new FITS_rec object do not seem to support 'ndarray.view'.

Since technically FITS_rec is still a subclass of ndarray, please at least mention this strange behavior in the documentation.
On the other hand, if only very few ndarray functions are still valid to FITS_rec, it may be worthwhile consider moving the base class away from ndarray to object.

Thank you!

Read astropy/io/fits/fitsrec.py around line 167 and review issue #4233 first. Identify which inherited numpy.ndarray methods are applicable to FITS_rec, including the reported view behavior, then update the documentation to state the supported behavior and limitations clearly.

Written by the indexing model from the issue text.