ref-manual: Added the packageinfo class.

(From yocto-docs rev: 509958a080dcefc6ec44a98fe89e0a762c27d2dc)

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

documentation/ref-manual/ref-classes.xml

@@ -1328,6 +1328,16 @@
     </para>
 </section>
 
+<section id='ref-classes-packageinfo'>
+    <title><filename>packageinfo.bbclass</filename></title>
+
+    <para>
+        The package information (<filename>packageinfo</filename>) class
+        gives a BitBake user interface the ability to retrieve information
+        about output packages from the <filename>pkgdata</filename> files.
+    </para>
+</section>
+
 <section id='ref-classes-perl'>
     <title>Perl Modules - <filename>cpan.bbclass</filename></title>