README: Correct documentation URL in top-level README file

even though redirection takes care of this, might as well be
accurate.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
[elizabeth.flanagan@intel.com: Fixed up submitted patch as it was corrupt as sent]
Signed-off-by: Elizabeth Flanagan <elizabeth.flanagan@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

README

@@ -18,7 +18,7 @@ e.g. for the hardware support. Poky is in turn a component of the Yocto Project.
 
 The Yocto Project has extensive documentation about the system including a 
 reference manual which can be found at:
-    http://yoctoproject.org/community/documentation
+    http://yoctoproject.org/documentation
 
 OpenEmbedded-Core is a layer containing the core metadata for current versions
 of OpenEmbedded. It is distro-less (can build a functional image with