update documentation for object transforms input node

docs/user_guide/nodes/object/object_transforms_input.rst

@@ -0,0 +1,18 @@
+Object info
+===========
+
+.. image:: object_transforms_input.png
+
+This node has 3 output sockets. The *Location* and *Scale* output have ``Vector``
+as data type while *Rotation* is an ``Euler`` value.
+
+In the advanced panel is an option to the current frame or not. If unchecked
+you can get the transformation of the object at a different point in time.
+
+Limitations:
+    - The rotation output only gives the correct result when the rotation mode
+      for the given object is Euler.
+    - The given transformation is not correct when the object is somehow parented
+      to another object because it will only give you the local transformation.
+      If that is not what you need, take a look at the "Object Matrix Input" node.
+      The limitation there is that you cannot get the transformation at another frame.