Updated Examples and Recipes (markdown)

Examples-and-Recipes.md

@@ -134,17 +134,17 @@ Example:
     {
         using namespace date;
         auto ymd = 2015_y/55/250;
-        std::cout << ymd << '\n';
+        std::cout << ymd << (ymd.ok() ? "\n" : " invalid date\n");
         ymd += months{0};
-        std::cout << ymd << '\n';
+        std::cout << ymd  << (ymd.ok() ? "\n" : " invalid date\n");
         ymd = day_point(ymd);
-        std::cout << ymd << '\n';
+        std::cout << ymd << (ymd.ok() ? "\n" : " invalid date\n");
     }
 
 Outputs:
 
-    2015-55-250
-    2019-07-250
+    2015-55-250 invalid date
+    2019-07-250 invalid date
     2020-03-06
 
 The specifications for these functions do not yet guarantee this "normalization behavior."  But the implementation has been thoroughly tested for this behavior and the specification will be updated soon.