[except.special.general] Complete the set of clause 17 references

Author: AlisdairM

source/exceptions.tex

@@ -1023,8 +1023,10 @@
 The function \tcode{std::terminate}\iref{except.terminate}
 is used by the exception
 handling mechanism for coping with errors related to the exception handling
-mechanism itself. The function
-\tcode{std::current_exception()}\iref{propagation} and the class
+mechanism itself.
+The function \tcode{std::uncaught_exceptions}\iref{uncaught.exceptions}
+reports how many exceptions are uncaught in the current thread.
+The function \tcode{std::current_exception}\iref{propagation} and the class
 \tcode{std::nested_exception}\iref{except.nested} can be used by a program to
 capture the currently handled exception.