Update steer_behaviours.adoc

Fixed broken link.

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

@@ -13,7 +13,8 @@ Steer behaviors allows you to control the locomotion of “characters”, this c
 .YouTube
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-a|.Steer behaviors in action image:jme3/advanced/hqdefault.jpg,width="",height="",link=https://youtu.be/yyzTntsGV00]
+a|.Steer behaviors in action
+image:jme3/advanced/hqdefault.jpg[youtu.be/yyzTntsGV00,width="",height="",link=https://youtu.be/yyzTntsGV00]
 a|
 
 |===