Bug #1541682: Fix example in the "Refcount details" API docs.
Additionally, remove a faulty example showing PySequence_SetItem applied
to a newly created list object and add notes that this isn't a good idea.
diff --git a/Doc/api/abstract.tex b/Doc/api/abstract.tex
index 9c39403..2ea11d1 100644
--- a/Doc/api/abstract.tex
+++ b/Doc/api/abstract.tex
@@ -5,6 +5,10 @@
numerical types, or all sequence types). When used on object types
for which they do not apply, they will raise a Python exception.
+It is not possible to use these functions on objects that are not properly
+initialized, such a list object that has been created by
+\cfunction{PyList_New()}, but whose items have not been set to some
+non-\code{NULL} value yet.
\section{Object Protocol \label{object}}