mruby-exit.c: add reference to `exit` method.
Currently `exit` works as `exit!` (no handler). It should be fixed
soon.
# define EXIT_FAILURE 1
#endif
+/*
+ * call-seq:
+ * exit(status=false)
+ *
+ * Exits the process immediately. No exit handlers are run currently.
+ * <em>status</em> is returned to the underlying system as the
+ * exit status.
+ *
+ * exit(true)
+ */
+
+/*
+ * call-seq:
+ * exit!(status=false)
+ *
+ * Exits the process immediately. No exit handlers are run.
+ * <em>status</em> is returned to the underlying system as the
+ * exit status.
+ *
+ * exit!(true)
+ */
static mrb_value
f_exit_bang(mrb_state *mrb, mrb_value self)
{
