Mention value initialization

It will be very useful to discuss the concepts of value initialization and default initialization.

Author: science-enthusiast

docs/cpp/initializing-classes-and-structs-without-constructors-cpp.md

@@ -42,7 +42,7 @@ int main()
     // Member initialization (in order of declaration):
     TempData td{ 45978, time(&time_to_set), 28.9, 37.0, 16.7 };
 
-    // Default initialization = {0,0,0,0,0}
+    // Value initialization = {0,0,0,0,0}
     TempData td_default{};
 
     // Uninitialized = if used, emits warning C4700 uninitialized local variable