contents: make the Partition Equal Subset Sum link both (#246)

"Partition Equal Subset Sum" and "0/1 Knapsack"

Closes #234

contents/algorithms/dynamic-programming.md

@@ -16,7 +16,7 @@ Sometimes you do not need to store the whole DP table in memory, the last two va
 
 ## Recommended LeetCode questions
 
-- 0/1 Knapsack or [Partition Equal Subset Sum](https://leetcode.com/problems/partition-equal-subset-sum/)
+- [0/1 Knapsack or Partition Equal Subset Sum](https://leetcode.com/problems/partition-equal-subset-sum/)
 - [Climbing Stairs](https://leetcode.com/problems/climbing-stairs/)
 - [Coin Change](https://leetcode.com/problems/coin-change/)
 - [Longest Increasing Subsequence](https://leetcode.com/problems/longest-increasing-subsequence/)