Fix doc type

doc/library/tensor/basic.txt

@@ -510,7 +510,7 @@ TensorVariable
     .. method:: diagonal(offset=0, axis1=0, axis2=1)
     .. method:: astype(dtype)
     .. method:: take(indices, axis=None, mode='raise')
-    .. method:: copy() Return an new symbolic variable that copy the variable. Do not copy the tag.
+    .. method:: copy() Return an new symbolic variable that copy the variable. Does not copy the tag.
     .. method:: norm(L, axis=None)
     .. method:: nonzero(self, return_matrix=False)
     .. method:: nonzero_values(self)

theano/tensor/var.py

@@ -537,7 +537,7 @@ class _tensor_py_operators(object):
     def copy(self, name=None):
         """Return a symbolic copy and optionally assign a name.
 
-        Do not copy the tags.
+        Does not copy the tags.
         """
         copied_variable = theano.tensor.basic.tensor_copy(self)
         copied_variable.name = name