Misleading example for the Greedy Algorithms section

In the Greedy Algorithms section, coin change problem is provided as an example. This creates an impression that every coin change problem can be solved with greedy approach. This is incorrect since using greedy approach in some coin sets gives the incorrect result and needs to be solved with dynamic programming.

More info: https://stackoverflow.com/questions/13557979/why-does-the-greedy-coin-change-algorithm-not-work-for-some-coin-sets