typo/comments

doc/install_ubuntu.txt

@@ -242,16 +242,16 @@ Test GPU configuration
 
 .. note::
 
-   Ubuntu 10.04 LTS: default gcc version 4.4.3. gcc 4.1.2, 4.3.4 availables.
+   Ubuntu 10.04 LTS: default gcc version 4.4.3. gcc 4.1.2, 4.3.4 available.
 
-   Ubuntu 11.04: default gcc version 4.5.2. gcc 4.4.5 availables.
+   Ubuntu 11.04: default gcc version 4.5.2. gcc 4.4.5 available.
 
-   Ubuntu 11.10: default gcc version 4.6.1. gcc 4.4.6 and 4.5.3 availables.
+   Ubuntu 11.10: default gcc version 4.6.1. gcc 4.4.6 and 4.5.3 available.
 
-   Ubuntu 12.04 LTS: default gcc version 4.6.3. gcc 4.4.7 and 4.5.3 availables.
+   Ubuntu 12.04 LTS: default gcc version 4.6.3. gcc 4.4.7 and 4.5.3 available.
 
-   Ubuntu 12.10: default gcc version 4.7.2. gcc 4.4.7, 4.5.4 and 4.6.3 availables.
+   Ubuntu 12.10: default gcc version 4.7.2. gcc 4.4.7, 4.5.4 and 4.6.3 available.
 
-   Ubuntu 13.10: default gcc version 4.8.1. gcc 4.4.7, 4.6.4 and 4.7.3 availables.
+   Ubuntu 13.10: default gcc version 4.8.1. gcc 4.4.7, 4.6.4 and 4.7.3 available.
 
-   Ubuntu 14.04: default gcc version 4.8.2, gcc 4.4.7,, 4.6.4, and 4.7.3 availables.
+   Ubuntu 14.04: default gcc version 4.8.2, gcc 4.4.7,, 4.6.4, and 4.7.3 available.

theano/tensor/signal/downsample.py

@@ -309,9 +309,7 @@ class DownsampleFactorMaxGrad(Op):
                         zj = j // ds1
                         if (maxout[n, k, zi, zj] == x[n, k, i, j]):
                             gx[n, k, i, j] = gz[n, k, zi, zj]
-# Not needed as it is allocated with zeros
-#                        else:
-#                            gx[n, k, i, j] = 0
+                        # No else clause needed as it is allocated with zeros
         gx_stg[0] = gx
 
     def infer_shape(self, node, in_shapes):