Better doc and remove sphinx error.

doc/library/config.txt

@@ -460,7 +460,9 @@ import theano and print the config variable, as in:
 
     Default: '-lblas'
 
-    Link arguments to link against a (Fortran) level-3 blas implementation.
+    Link arguments to link against a (Fortran) level-3 blas
+    implementation.  The default will test if '-lblas' work. If not,
+    we will disable our c code for BLAS.
 
 .. attribute:: config.experimental.local_alloc_elemwise_assert
 

doc/library/tensor/nnet/conv.txt

@@ -164,7 +164,6 @@ TODO: Give examples on how to use these things! They are pretty complicated.
 
 .. autofunction:: theano.tensor.nnet.conv.conv2d
 .. autofunction:: theano.sandbox.cuda.fftconv.conv2d_fft
-.. autofunction:: theano.sandbox.cuda.blas.GpuCorrMM
 .. autofunction:: theano.sandbox.cuda.dnn.dnn_conv
 .. autofunction:: theano.tensor.nnet.Conv3D.conv3D
 .. autofunction:: theano.sandbox.cuda.fftconv.conv3d_fft