docblock updates

src/Utility/Language.php

@@ -9,7 +9,8 @@ class Language {
 
 	/**
 	 * @param string|null $languageList List of language codes or locales codes.
-	 * @param bool $forceLowerCase Flag to auto lower case country part of locale codes.
+	 * @param bool $forceAllLowerCase Flag to auto lower case country part of locale codes, defaults to force lower.
+	 * @param bool $keepDuplicates Flag to keep or discard duplicates, defaults to keep.
 	 *
 	 * @return array
 	 */