Update camera documentation.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3896 dfc29bdd-3216-0410-991c-e03cc46cb475

include/ICameraSceneNode.h

@@ -76,6 +76,9 @@ namespace scene
 		/** If the camera's target and rotation are bound ( @see
 		bindTargetAndRotation() ) then calling this will also change
 		the camera's scene node rotation to match the target.
+		Note that setTarget uses the current absolute position 
+		internally, so if you changed setPosition since last rendering you must
+		call updateAbsolutePosition before using this function.
 		\param pos Look at target of the camera, in world co-ordinates. */
 		virtual void setTarget(const core::vector3df& pos) =0;