documentation/poky-ref-manual/extendpoky.xml: removed pokylinux.org link
There was a link whose URL was http://autobuilder.pokylinux.org:8010.
I changed the link to use yoctoproject.org. Note that this URL
was not visible to the reader in the manual. However, it was there
in the DocBook code.
(From yocto-docs rev: ca1cf9fb404f148fe4f0868630dc4f109231c5c3)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>