Update contents/stacks_and_queues/code/c++/queue.cpp

removing unnecessary comment

Co-authored-by: Dimitri Belopopsky <ShadowMitia@users.noreply.github.com>

Author: ishwar00

contents/stacks_and_queues/code/c++/queue.cpp

@@ -58,7 +58,6 @@ namespace my {
 
         T& front() const { return _front->value; }
         T const& front() const { return _front->value; }
-        // returning reference can very usefull if someone wants to modify _front element
 
         size_t size() const { return count; }