Extended the docblock of Style::applyFromArray with example for alignment styling

src/PhpSpreadsheet/Style/Style.php

@@ -176,6 +176,11 @@ class Style extends Supervisor
      *                 ]
      *             ]
      *         ],
+     *         'alignment' => [
+     *             'horizontal' => Alignment::HORIZONTAL_CENTER,
+     *             'vertical' => Alignment::VERTICAL_CENTER,
+     *             'wrapText' => true,
+     *         ],
      *         'quotePrefix'    => true
      *     ]
      * );