fix header attributes

docs/modules/tutorials/pages/intermediate/math_video_tutorials.adoc

@@ -1,10 +1,7 @@
-= math_video_tutorials
-:author: 
-:revnumber: 
-:revdate: 2016/03/17 20:48
-:relfileprefix: ../
-:imagesdir: ..
-ifdef::env-github,env-browser[:outfilesuffix: .adoc]
+= Math Video Tutorials
+:author:
+:revnumber:
+:revdate: 2020/07/13
 
 
 *jME3 Math Video Tutorials*