Docs: Fix incorrect docblock for WP_Translation_Controller::translate_plural.

Props szepeviktor.
See #60699.

git-svn-id: https://develop.svn.wordpress.org/trunk@58155 602fd350-edb4-49c9-b593-d223f7449a82

Author: swissspidy

src/wp-includes/l10n/class-wp-translation-controller.php

@@ -282,16 +282,16 @@ public function translate( string $text, string $context = '', string $textdomai
 	 *
 	 * @since 6.5.0
 	 *
-	 * @param array{0: string, 1: string} $plurals {
+	 * @param array       $plurals {
 	 *     Pair of singular and plural translations.
 	 *
 	 *     @type string $0 Singular translation.
 	 *     @type string $1 Plural translation.
 	 * }
-	 * @param int                         $number     Number of items.
-	 * @param string                      $context    Optional. Context for the string. Default empty string.
-	 * @param string                      $textdomain Optional. Text domain. Default 'default'.
-	 * @param string                      $locale     Optional. Locale. Default current locale.
+	 * @param int         $number     Number of items.
+	 * @param string      $context    Optional. Context for the string. Default empty string.
+	 * @param string      $textdomain Optional. Text domain. Default 'default'.
+	 * @param string|null $locale     Optional. Locale. Default current locale.
 	 * @return string|false Translation on success, false otherwise.
 	 */
 	public function translate_plural( array $plurals, int $number, string $context = '', string $textdomain = 'default', ?string $locale = null ) {