No support for MySQL, so no need to link to it's docs.

libraries/common.lib.php

@@ -346,7 +346,6 @@ function PMA_formatSql($parsed_sql, $unparsed_sql = '')
  * @uses    $cfg['MySQLManualType']
  * @uses    $cfg['MySQLManualBase']
  * @uses    $cfg['ReplaceHelpImg']
- * @uses    $GLOBALS['mysql_4_1_doc_lang']
  * @uses    $GLOBALS['mysql_5_1_doc_lang']
  * @uses    $GLOBALS['mysql_5_0_doc_lang']
  * @uses    $GLOBALS['strDocu']

libraries/messages.inc.php

@@ -22,7 +22,6 @@ $byteUnits = array(__('B'), __('KiB'), __('MiB'), __('GiB'), __('TiB'), __('PiB'
 
 // MySQL manual language definition, this is optional, en will be used
 // if not defined
-$mysql_4_1_doc_lang = _pgettext('$mysql_4_1_doc_lang', 'en');
 $mysql_5_0_doc_lang = _pgettext('$mysql_5_0_doc_lang', 'en');
 $mysql_5_1_doc_lang = _pgettext('$mysql_5_1_doc_lang', 'en');