Update 280._Wiggle_Sort.md

Author: 0xkookoo

docs/Leetcode_Solutions/280._Wiggle_Sort.md

@@ -79,7 +79,7 @@ class Solution(object):
         :type nums: List[int]
         :rtype: void Do not return anything, modify nums in-place instead.
         """
-        for i in range(len(nums)):
+        for i in range(1, len(nums)):
             if (i & 1 == 0 and nums[i] > nums[i-1]) or (i & 1 != 0 and nums[i] < nums[i-1]):
                 nums[i], nums[i-1] = nums[i-1], nums[i]
 ```