Fix phpdox xml namespace

Author: yukoff

build/phpdox.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8" ?>
-<phpdox xmlns="http://phpdox.net/config">
+<phpdox xmlns="http://xml.phpdox.net/config">
     <project name="php-tmdb-api" source="${basedir}/../lib" workdir="${basedir}/phpdox">
         <collector backend="parser" />