Fix a typo in "Combination Sum" #34
Merged
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On the problem's website :
https://oj.leetcode.com/problems/combination-sum/
the description of the problem had changed.
As the Note says, elements are in non-descending order, the greater-than sign
may lead to misunderstanding, and Leetcode had changed it to less-and-equal-than sign.
so I updated the content in the source file.