.NET9 What's new - Runtime - align name with sample code snippet (dotnet#42427)

Author: hakenr

docs/core/whats-new/snippets/dotnet-9/csharp/Runtime.cs

@@ -7,12 +7,12 @@
 class Runtime
 {
     // <SnippetForLoop>
-    static int Sum(int[] arr)
+    static int Sum(int[] nums)
     {
         int sum = 0;
-        for (int i = 0; i < arr.Length; i++)
+        for (int i = 0; i < nums.Length; i++)
         {
-            sum += arr[i];
+            sum += nums[i];
         }
 
         return sum;