doc/library/tensor/basic.txt: add alloc() to the list of ways of creating a tensor

doc/library/tensor/basic.txt

@@ -295,7 +295,6 @@ them perfectly, but a dscalar otherwise.
     :rtype: :class:`TensorVariable` or :class:`TensorConstant`
 
 
-
 TensorType and TensorVariable
 =============================
 
@@ -599,6 +598,12 @@ dimensions, see :meth:`_tensor_py_operators.dimshuffle`.
 
     Create a matrix by filling the shape of `a` with `b`
 
+.. function:: alloc(value, *shape)
+
+    :param value: a value with which to fill the output
+    :param shape: the dimensions of the returned array
+    :returns: an N-dimensional tensor initialized by `value` and having the specified shape.
+
 .. function:: eye(n, m=None, k=0, dtype=theano.config.floatX)
 
     :param n: number of rows in output (value or theano scalar)