You probably need to add a docstring for `class BaseColumn` in `astropy/table/column.py`:
```
"""
Base class for table Column classes.
"""
```
Then this an similar refs should be like:
```
:func:`~astropy.table.column.BaseColumn.pprint`
```
From what I can see the API docs are not including inherited methods so you need to specifically find where in the hierarchy each method is defined.