Deleted 4 old and low rated notes

Following were the 4 notes with a rating less than -5 and
are older than 1 year.

These notes represented 0.0% of the 15887 total user notes,
and have now been removed.

Rating | Note
-------+---------------------------------------------------------
   -6  | https://php.net/manual/en/function.ftp-get.php#119804
   -6  | https://php.net/manual/en/function.sprintf.php#120670
   -6  | https://php.net/manual/en/zip.installation.php#129230
   -6  | https://php.net/manual/en/ref.url.php#13101