test-manual: Add SPDX license headers

[Yocto #13873]

(From yocto-docs rev: 33ba40c062ca081dbcffc5400fb49e56d6f7f25e)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/test-manual/test-manual-customization.xsl

@@ -1,4 +1,6 @@
 <?xml version='1.0'?>
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
+
 <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" />

documentation/test-manual/test-manual-intro.xml

@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='test-manual-intro'>
 

documentation/test-manual/test-manual-style.css

@@ -1,6 +1,8 @@
 /*
    Generic XHTML / DocBook XHTML CSS Stylesheet.
 
+   SPDX-License-Identifier: CC-BY-2.0-UK
+
    Browser wrangling and typographic design by
       Oyvind Kolas / pippin@gimp.org
 

documentation/test-manual/test-manual-test-process.xml

@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='test-manual-test-process'>
 

documentation/test-manual/test-manual-understand-autobuilder.xml

@@ -1,6 +1,7 @@
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <chapter id='test-manual-understand-autobuilder'>
 

documentation/test-manual/test-manual.xml

@@ -1,6 +1,7 @@
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
 
 <book id='test-manual' lang='en'
       xmlns:xi="http://www.w3.org/2003/XInclude"