Deleted 6 old and low rated notes

Following were the 6 notes with a rating less than -5 and
are older than 1 year.

These notes represented 0.0% of the 16777 total user notes,
and have now been removed.

Rating | Note
-------+---------------------------------------------------------
   -6  | https://php.net/manual/en/function.rawurldecode.php#122749
   -6  | https://php.net/manual/en/class.typeerror.php#123727
   -6  | https://php.net/manual/en/mysqli.insert-id.php#113152
   -6  | https://php.net/manual/en/function.jddayofweek.php#125298
   -6  | https://php.net/manual/en/function.list.php#124227
   -6  | https://php.net/manual/en/function.mb-substr.php#119517