Merge pull request lisa-lab#39 from nouiz/master

Do the same fix in the doc then what was done in the code.

Author: lamblin

Diff for: doc/DBN.txt

@@ -161,8 +161,8 @@ classification.
             :type n_ins: int
             :param n_ins: dimension of the input to the DBN
 
-            :type n_layers_sizes: list of ints
-            :param n_layers_sizes: intermediate layers size, must contain
+            :type hidden_layers_sizes: list of ints
+            :param hidden_layers_sizes: intermediate layers size, must contain
                                at least one value
 
             :type n_outs: int