Fixed section markers

Author: carriepl

doc/lstm.txt

@@ -124,7 +124,7 @@ output gates and, subsequently, their outputs :
     h_t = o_t * tanh(C_t)
 
 Our model
----------
+=========
 
 The model we used in this tutorial is a variation of the standard LSTM model.
 In this variant, the activation of a cell’s output gate does not depend on the
@@ -216,7 +216,7 @@ Please email `Kyunghyun Cho <http://www.kyunghyuncho.me/>`_ for any
 problem report or feedback. We will be glad to hear from you.
 
 References
-==========
+++++++++++
 
 * Hochreiter, S., & Schmidhuber, J. (1997). Long short-term memory. Neural computation, 9(8), 1735-1780.