Added "how_to_use_materials" to sdk help wiki_help.properties

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9183 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

sdk/jme3-core/javahelp/wiki_help.properties

@@ -41,6 +41,7 @@ jme3:intermediate:appsettings,\
 jme3:intermediate:best_practices,\
 jme3:intermediate:file_types,\
 jme3:intermediate:headlessserver,\
+jme3:intermediate:how_to_use_materials,\
 jme3:intermediate:math,\
 jme3:intermediate:optimization,\
 jme3:intermediate:simpleapplication,\