Fix typos in deleted methods

src/core/model/simulator.h

@@ -68,7 +68,7 @@ class Scheduler;
 class Simulator
 {
 public:
-  // Delete copy constructor and assignment operator to avoid misuse
+  // Delete default constructor and destructor to avoid misuse
   Simulator () = delete;
   ~Simulator () = delete;
 

src/internet/helper/ipv4-list-routing-helper.h

@@ -55,7 +55,7 @@ public:
    */
   Ipv4ListRoutingHelper (const Ipv4ListRoutingHelper &o);
 
-  // Delete copy constructor and assignment operator to avoid misuse
+  // Delete assignment operator to avoid misuse
   Ipv4ListRoutingHelper &operator= (const Ipv4ListRoutingHelper &) = delete;
 
   /**