documentation/poky-ref-manual/introduction.xml: Removed link
Removed a link to the Intel Website. Upon testing this link I
discovered that it loads the Intel site into the current web
page and then disables the back button. Rather annoying. I tried
to change the link to pop a new window but couldn't get the
ulink.target parameter to work. Ran out of time to try and figure
it out so I removed the link.
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
