5.5.9+dfsg-1ubuntu4.24) is not available, but a newer one is (5.5.9+dfsg-1ubuntu4.27). We redirected you there.
/usr/share/doc/php5 is in php5 5.5.9+dfsg-1ubuntu4.27.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/php5-common