corrected doc

doc/library/sparse/index.txt

@@ -43,10 +43,10 @@ grad?
       constant.  This function is called "structured_dot"
     - theano.sparse.structured_dot and its grad (structured_dot_grad)
     - theano.dot call it.
-    - dot(sparse, dense) and dot(dense, sparse) through transposition
+    - dot(sparse, dense) and dot(dense, sparse), dot(sparse, sparse)
 
 - Dot
-    - performs the true dot
+    - performs the true dot without special semantics.
     - dot(sparse, dense), dot(dense, sparse), dot(sparse, sparse)
     - When the operation has the form dot(csr_matrix, dense) the gradient of
     this operation can be performed inplace by UsmmCscDense. This leads to