Doctest fix in sage/categories/modules_with_basis.py

<div id="comment:0"></div>

Line 1041 is 

```
sage: B = HopfAlgebrasWithBasis(QQ).example(); A
```
It should be printing B.

CC:  @robertwb

Component: **doctest coverage**

Author: **David Roe**

Reviewer: **Jim Stark**

Merged: **sage-5.0.beta8**

_Issue created by migration from https://trac.sagemath.org/ticket/12392_

