Infinite lifetime option for the runtime logger state: improving the …

…FAQ by Swebb's suggestion

src/site/markdown/faq.md

@@ -89,3 +89,11 @@ loggername - ?????????? ???? ??????????????
 
 The important thing to understand is that this is some always applied, backwards compatible default
 behaviour and even the case when the current environment sets a locale like `en_US.UTF-8`.
+
+##Does Log4cxx support logging at process termination?
+
+Log4cxx must be built with -DLOG4CXX_EVENTS_AT_EXIT=ON to use logging during the application
+termination (i.e. in static destuctors and other atexit() functions) . When this option is used,
+the dynamic memory deallocation, buffer flushing and file handle closing normally done in destructors
+is not performed. Do not set the "BufferedIO" option of any log4cxx::FileAppender to true when using
+this option.