finished updating docs for dnn.conv algo flags

doc/library/config.txt

@@ -658,10 +658,9 @@ import theano and print the config variable, as in:
 
     Default: ``small``
 
-    3d convolution only support ``none``, ``guess_once``,
+    3d convolution only support ``none``, ``winograd``, ``guess_once``,
     ``guess_on_shape_change``, ``time_once``, ``time_on_shape_change``.
 
-
 .. attribute:: config.dnn.conv.algo_bwd
 
     Deprecated, use :attr:`config.dnn.conv.algo_bwd_filter` and
@@ -675,7 +674,7 @@ import theano and print the config variable, as in:
 
     Default: ``none``
 
-    3d convolution only support ``none``, ``guess_once``,
+    3d convolution only supports ``none``, ``guess_once``,
     ``guess_on_shape_change``, ``time_once``, ``time_on_shape_change``.
 
 .. attribute:: config.dnn.conv.algo_bwd_data
@@ -687,8 +686,9 @@ import theano and print the config variable, as in:
 
     Default: ``none``
 
-    3d convolution only support ``none``, ``guess_once``,
-    ``guess_on_shape_change``, ``time_once``, ``time_on_shape_change``.
+    3d convolution only support ``none``, ``winograd``,
+    ``guess_once``, ``guess_on_shape_change``, ``time_once``,
+    ``time_on_shape_change``.
 
 .. attribute:: config.gcc.cxxflags