Python: expand comment on flow summaries

Author: yoff

python/ql/lib/semmle/python/dataflow/new/internal/FlowSummaryImplSpecific.qll

@@ -25,6 +25,10 @@
  *
  * We do not support summaries of special methods via the special methods framework,
  * the summary would have to identify the call.
+ *
+ * We might, while we still extract the standard libraries, want to support flow summaries of
+ * extracted callables, so that we can model part of the standard libraries with flow summaries.
+ * For this to work, we have be careful with the enclosiong callable predicate.
  */
 
 private import python