Clarify comment about packing in PartOne method

Updated comment for clarity regarding packing.

Author: encse

2025/Day12/Solution.cs

@@ -9,10 +9,10 @@ class Solution : Solver {
 
     public object PartOne(string input) {
         // It's enough to check if the 3x3 area of the presents is less than 
-        // the area under 🎄 tree. No packing is required.
+        // the area under 🎄 tree. No packing required.
         return input.Split("\n\n").Last()
             .Split("\n")
             .Select(line => Regex.Matches(line, @"\d+").Select(m => int.Parse(m.Value)).ToArray())
             .Count(nums => nums[0] * nums[1] >= 9 * nums[2..].Sum());
     }
-}
+}