having links in the caption of a figure breaks the latex compilation, moving the description lower

doc/tutorial/symbolic_graphs.txt

@@ -41,9 +41,10 @@ details about these building blocks see :ref:`variable`, :ref:`op`,
 .. figure:: apply.png 
     :align: center
 
-    Arrows represent references to the Python objects pointed at. The blue
-    box is an :ref:`apply` node. Red boxes are :ref:`variable` nodes. Green
-    circles are :ref:`Ops <op>`. Purple boxes are :ref:`Types <type>`.
+
+Arrows represent references to the Python objects pointed at. The blue
+box is an :ref:`apply` node. Red boxes are :ref:`variable` nodes. Green
+circles are :ref:`Ops <op>`. Purple boxes are :ref:`Types <type>`.
 
 
 The graph can be traversed starting from outputs (the result of some