Update space_complexity.md

Fix the Go code.

docs/chapter_computational_complexity/space_complexity.md

@@ -223,7 +223,7 @@ comments: true
         b := make([]int, 10000)     // O(1)
         var nums []int
         if n > 10 {
-            nums = make([]int, 10000)  // O(n)
+            nums := make([]int, n)  // O(n)
         }
         fmt.Println(a, b, nums)
     }