📝 improved documentation for dump and iterator_wrapper

doc/examples/dump.cpp

@@ -28,4 +28,15 @@ int main()
     std::cout << "strings:" << '\n'
               << j_string.dump() << '\n'
               << j_string.dump(-1, ' ', true) << '\n';
+
+    // create JSON value with invalid UTF-8 byte sequence
+    json j_invalid = "\xF0\xA4\xAD\xC0";
+    try
+    {
+        std::cout << j_invalid.dump() << std::endl;
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
 }

doc/examples/dump.link

@@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/UnV6etCOZZRZpYyB"><b>online</b></a>
+<a target="_blank" href="https://wandbox.org/permlink/mHH9TibITCYPpLwy"><b>online</b></a>

doc/examples/dump.output

@@ -50,3 +50,4 @@ arrays:
 strings:
 "Hellö 😀!"
 "Hell\u00f6 \ud83d\ude00!"
+[json.exception.type_error.316] invalid UTF-8 byte at index 3: 0xC0