Rename loop variables for clarity and consistency

Updated variable names in JsonPrinter to improve readability and better reflect their purpose. This change enhances the maintainability of the code without modifying functionality.

Author: raffaelecarelle

src/Printer/JsonPrinter.php

@@ -16,17 +16,17 @@ public function print(array $violationsCollection): string
          * @var string      $key
          * @var Violation[] $violationsByFqcn
          */
-        foreach ($violationsCollection as $key => $violationsByFqcn) {
+        foreach ($violationsCollection as $class => $violationsByFqcn) {
             $violationForThisFqcn = \count($violationsByFqcn);
             $totalViolations += $violationForThisFqcn;
 
-            $details[$key] = [];
+            $details[$class] = [];
 
-            foreach ($violationsByFqcn as $kv => $violation) {
-                $details[$key][$kv]['error'] = $violation->getError();
+            foreach ($violationsByFqcn as $key => $violation) {
+                $details[$class][$key]['error'] = $violation->getError();
 
                 if (null !== $violation->getLine()) {
-                    $details[$key][$kv]['line'] = $violation->getLine();
+                    $details[$class][$key]['line'] = $violation->getLine();
                 }
             }
         }