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 17108 total user notes,
and have now been removed.

Rating | Note
-------+---------------------------------------------------------
   -7  | https://php.net/manual/en/function.curl-init.php#129047
   -6  | https://php.net/manual/en/control-structures.switch.php#128963
   -6  | https://php.net/manual/en/gnupg.requirements.php#112899
   -6  | https://php.net/manual/en/function.spl-autoload-register.php#116811
   -6  | https://php.net/manual/en/class.runtimeexception.php#119546
   -6  | https://php.net/manual/en/function.spl-autoload-register.php#115154