Found a link leading to a wrong page

[UponTheSky]

I guess this is kind of a minor problem, so I just make this issue to let you know, without making a PR.

Currently, the stack algorithm page has two different question links that lead to the same page of the leetcode question(I just copied them so that you could see what's happening):

• Implement Queue using Stacks
• Implement Stack using Queues

As you see, both links lead to the question 232, Implement Queue using Stacks.

The link "Implement Stack using Queues" should be connected to the question 225, Implement Stack using Queues.

Hope this would be helpful.

Thank you for the useful materials!