sdk-manual: Updated the normal customization.xml file.

Needs to used the downloadable XSL files and not the static
local 1.76.1 versions.

(From yocto-docs rev: 1dfc6081ffb745e424ff5f73c708e2559466831e)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/sdk-manual/sdk-manual-customization.xsl

@@ -1,12 +1,11 @@
 <?xml version='1.0'?>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0">
 
-<!--  <xsl:import href="http://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-xsl-1.76.1/xhtml/docbook.xsl" />
--->
+  <xsl:import href="http://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-xsl-1.76.1/xhtml/docbook.xsl" />
 
+<!--
   <xsl:import href="../template/1.76.1/docbook-xsl-1.76.1/xhtml/docbook.xsl" />
 
-<!--
   <xsl:import href="http://docbook.sourceforge.net/release/xsl/1.76.1/xhtml/docbook.xsl" />
 
 -->