fix doc syntax error.

doc/library/tensor/nnet/conv.txt

@@ -8,7 +8,7 @@
 
     Two similar implementation exists for conv2d:
     :func:`signal.conv2d <theano.tensor.signal.conv.conv2d>` and
-    :func:`nnet.conv2d <theano.tensor.nnet.conv.conv2d>. The former implements a traditional
+    :func:`nnet.conv2d <theano.tensor.nnet.conv.conv2d>`. The former implements a traditional
     2D convolution, while the latter implements the convolutional layers
     present in convolutional neural networks (where filters are 3D and pool
     over several input channels).

doc/tutorial/python-memory-management.txt

@@ -158,7 +158,7 @@ on a 32-bit platform and
       96 [4, 'toaster', 230.1]
 
 on a 64-bit platform. An empty list eats up 72 bytes. The size of an
-empty, 64-bit C++ ``std::list()``is only 16 bytes, 4-5 times less. What
+empty, 64-bit C++ ``std::list()`` is only 16 bytes, 4-5 times less. What
 about tuples? (and dictionaries?):
 
 ::