documentation/dev-manual: Converted to use poky.ent

I converted the hard links to use the variables as established
in the file poky.ent.

Also, Cleaned up some bad text in the term "Yocto Project Files."
Looks like a cut-and-paste problem.

(From yocto-docs rev: e2e20bf4895d80dae73595e93132f37fb31121d1)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/dev-manual.xml

@@ -1,5 +1,6 @@
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
+[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
 
 <book id='dev-manual' lang='en' 
       xmlns:xi="http://www.w3.org/2003/XInclude"
@@ -36,7 +37,7 @@
         </revhistory>
 
     <copyright>
-     <year>2010-2012</year>
+     <year>&COPYRIGHT_YEAR;</year>
       <holder>Linux Foundation</holder>
     </copyright>
 
@@ -51,9 +52,9 @@
       <note>
           Due to production processes, there could be differences between the Yocto Project
           documentation bundled in the release tarball and  
-          <ulink url='http://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html'>
+          <ulink url='&YOCTO_DOCS_DEV_URL;'>
           The Yocto Project Development Manual</ulink> on
-          the <ulink url='http://www.yoctoproject.org'>Yocto Project</ulink> website.
+          the <ulink url='&YOCTO_HOME_URL;'>Yocto Project</ulink> website.
           For the latest version of this manual, see the manual on the website.
       </note>
     </legalnotice>