a sentence in sepgsql.sgml says 180-degree opposite

I noticed a sentence in sepgsql says 180-degree opposite at:

  When <literal>DROP</> command is executed, <literal>drop</> will be
  checked on the object being removed for each object types.  Permissions
  "will not be" checked for objects dropped indirectly via <literal>CASCADE</>.

This should be "will also be", as our implementation doing.
I'm not sure why I described such a wrong stuff. Anyway, the attached
patch will fix it.

Thanks,
--
KaiGai Kohei <kaigai@kaigai.gr.jp>