Update release note

FROM.

FROM.

Cherrypicks round2

in the index.

This CL creates an overabundance of tags on class pages, but that
doesn't hurt as long as we know ours. Demo reference to class field
(tf.GraphKeys.REGULARIZATION_LOSSES) is in get_variable.md.
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Cherrypicks

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TASK 2. //training/... Python class doc strings
Change: 147434408

Old:
/// Copy Op.
///
/// Performs CPU-to-CPU or GPU-to-GPU deep-copying of tensor, depending on the
/// device on which the tensor is allocated.
///
/// Unlike the CopyHost Op, this op does not have HostMemory constraint on its
/// input or output.
///
/// Arguments:
/// * scope: A Scope object
/// * input: Input tensor.
///
/// Returns:
/// * `Output`: Output tensor, deep-copied from input.
class Copy {...}

New:
/// Copy Op.
///
/// Performs CPU-to-CPU or GPU-to-GPU deep-copying of tensor, depending on the
/// device on which the tensor is allocated.
///
/// Unlike the CopyHost Op, this op does not have HostMemory constraint on its
/// input or output.
///
/// Arguments:
/// * scope: A Scope object
/// * input: Input tensor.
///
/// Optional attributes (see `Attrs`):
/// * tensor_name: The name of the input tensor.
///
/// Returns:
/// * `Output`: Output tensor, deep-copied from input.
class Copy {...}
Change: 147432712

Old:
  /// Optional attribute setters for Copy :
  ///
  /// TensorName(StringPiece): Defaults to ""
  ///     The name of the input tensor.
  struct Attrs {
    Attrs TensorName(StringPiece x) {
      Attrs ret = *this;
      ret.tensor_name_ = x;
      return ret;
    }

    StringPiece tensor_name_ = "";
  };

New:
  /// Optional attribute setters for Copy
  struct Attrs {
    /// The name of the input tensor.
    ///
    /// Defaults to ""
    Attrs TensorName(StringPiece x) {
      Attrs ret = *this;
      ret.tensor_name_ = x;
      return ret;
    }

    StringPiece tensor_name_ = "";
  };
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Removes the API guide for TensorArray for the moment, since all of its useful content is in the class docstring.
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Seal contrib

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Improve collection name handling.
Added helper to retrieve corresponding tensor/op.
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CP 1.0