Deleted 9 old and low rated notes

Following were the 9 notes with a rating less than -5 and
are older than 1 year.

These notes represented 0.1% of the 17799 total user notes,
and have now been removed.

Rating | Note
-------+---------------------------------------------------------
   -6  | https://php.net/manual/en/function.passthru.php#13535
   -6  | https://php.net/manual/en/mysqli.error.php#60669
   -6  | https://php.net/manual/en/reserved.variables.server.php#128431
   -6  | https://php.net/manual/en/thread.getcurrentthreadid.php#126179
   -6  | https://php.net/manual/en/function.html-entity-decode.php#93378
   -6  | https://php.net/manual/en/thread.getcurrentthreadid.php#126982
   -6  | https://php.net/manual/en/function.passthru.php#11298
   -6  | https://php.net/manual/en/mysqli.rollback.php#92395
   -6  | https://php.net/manual/en/thread.getcurrentthreadid.php#126178