Deleted 5 old and low rated notes

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

These notes represented 0.0% of the 17555 total user notes,
and have now been removed.

Rating | Note
-------+---------------------------------------------------------
   -6  | https://php.net/manual/en/function.mysql-fetch-array.php#41662
   -6  | https://php.net/manual/en/language.oop5.properties.php#127656
   -6  | https://php.net/manual/en/reserved.variables.server.php#125050
   -6  | https://php.net/manual/en/function.ob-flush.php#54068
   -6  | https://php.net/manual/en/function.session-id.php#37017