Update steer_behaviours.adoc

Fixed broken links.
Added table for youtube and uploaded default image.
Fixed broken new lines.

src/docs/asciidoc/jme3/advanced/steer_behaviours.adoc

@@ -8,12 +8,18 @@ ifdef::env-github,env-browser[:outfilesuffix: .adoc]
 
 
 Steer behaviors allows you to control the locomotion of “characters”, this can reduce drastically the time needed to develop a game since for almost every game we need to set how these “characters” will be moving around the scene.
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-*Steer behaviors in action:*
-image:jme3/advanced/youtube_yyztntsgv00[youtube_yyztntsgv00,width="",height=""]
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-Be sure that you have checked the demos: They can be downloaded here: link:http://localhost/jmeSteerTesting/downloads.php[jmesteer.bdevel.org]
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+[cols="2",caption=]
+.YouTube
+|===
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+a|.Steer behaviors in action image:jme3/advanced/hqdefault.jpg,width="",height="",link=https://youtu.be/yyzTntsGV00]
+a|
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+|===
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+Be sure that you have checked the demos: They can be downloaded here: link:http://jmesteer.bdevel.org[jmesteer.bdevel.org]
 
 
 == First steps