Added link to quaternion page.

src/docs/asciidoc/jme3/rotate.adoc

@@ -189,3 +189,4 @@ You can do all transformations in individual steps (and then update the objects
 
 *  com.jme3.math.Transform, interpolateTransforms() – interpolate a step between two transformations
 **  link:https://javadoc.jmonkeyengine.org/index.html?com/jme3/math/Transform.html[com.jme.math.Transform]
+*  In case you missed it, see also <<jme3/quaternion#,Quaternion>>.