Typo fix.

Doc/ext/embedding.tex

@@ -189,7 +189,7 @@ as its argument, which is constructed using the
 
 Once the script is loaded, the name we're looking for is retrieved
 using \cfunction{PyObject_GetAttrString()}.  If the name exists, and
-the object retunred is callable, you can safely assume that it is a
+the object returned is callable, you can safely assume that it is a
 function.  The program then proceeds by constructing a tuple of
 arguments as normal.  The call to the Python function is then made
 with: