SF bug #936827: PyNumber_And() 's description

Fix typo.

Doc/api/abstract.tex

@@ -517,7 +517,7 @@ determination.
 
 
 \begin{cfuncdesc}{PyObject*}{PyNumber_And}{PyObject *o1, PyObject *o2}
-  Returns the ``bitwise and'' of \var{o2} and \var{o2} on success and
+  Returns the ``bitwise and'' of \var{o1} and \var{o2} on success and
   \NULL{} on failure. This is the equivalent of the Python expression
   \samp{\var{o1} \&\ \var{o2}}.
 \end{cfuncdesc}