Generic/JumbledIncrementer: rename variable to make test easier to read

Using `$same` instead of `$i` should help highlight which variable is
expected to trigger the sniff when reading the test code.

Author: rodrigoprimo

src/Standards/Generic/Tests/CodeAnalysis/JumbledIncrementerUnitTest.1.inc

@@ -1,8 +1,8 @@
 <?php
 
-for ($i = 0; $i < 20; $i++) {
-    for ($j = 0; $j < 5; $i += 2) {
-        for ($k = 0; $k > 3; $i++) {
+for ($same = 0; $same < 20; $same++) {
+    for ($j = 0; $j < 5; $same += 2) {
+        for ($k = 0; $k > 3; $same++) {
 
         }
     }
@@ -17,8 +17,8 @@ for ($i = 0; $i < 20; $i++) {
 }
 
 for ($i = 0; $i < 20; $i++) {
-    for ($j = 0; $j < 5; $j += 2) {
-        for ($k = 0; $k > 3; $j++) {
+    for ($same = 0; $same < 5; $same += 2) {
+        for ($k = 0; $k > 3; $same++) {
 
         }
     }