This seems a bit unwieldy, particularly if viewing help on the console.  What about 
```
input : str or fileobj or compatible `astropy.io.fits` HDU object
    If a string, the filename to read the table from. If a file object or
    compatible HDU object (see below), the object to extract the table from.
...

The following `astropy.io.fits` HDU objects can be used as input:

- :class:`~astropy.io.fits.hdu.table.TableHDU`
- etc
```