message: Clarify parse_sequence_example and parse_single_sequence_example documentation.
diff: @@ -1173,8 +1173,8 @@ def parse_sequence_example(serialized,
  [`SequenceExample`](https://www.tensorflow.org/code/tensorflow/core/example/example.proto)
  protos given in `serialized`.
  - This op parses serialized sequence examples into a tuple of dictionaries
  - mapping keys to `Tensor` and `SparseTensor` objects respectively.
  + This op parses serialized sequence examples into a tuple of dictionaries,
  + each mapping keys to `Tensor` and `SparseTensor` objects.
  The first dictionary contains mappings for keys appearing in
  `context_features`, and the second dictionary contains mappings for keys
  appearing in `sequence_features`.
  @@ -1519,8 +1519,8 @@ def parse_single_sequence_example(
  Parses a single serialized [`SequenceExample`](https://www.tensorflow.org/code/tensorflow/core/example/example.proto)
  proto given in `serialized`.
  - This op parses a serialized sequence example into a tuple of dictionaries
  - mapping keys to `Tensor` and `SparseTensor` objects respectively.
  + This op parses a serialized sequence example into a tuple of dictionaries,
  + each mapping keys to `Tensor` and `SparseTensor` objects.
  The first dictionary contains mappings for keys appearing in
  `context_features`, and the second dictionary contains mappings for keys
  appearing in `sequence_features`.
  @@ -1563,6 +1563,10 @@ def parse_single_sequence_example(
  proto. This may be useful for debugging purposes, but it has no effect on the
  output. If not `None`, `example_name` must be a scalar.
  + Note that the batch version of this function, `tf.parse_sequence_example`,
  + is written for better memory efficiency and will be faster on large
  + `SequenceExample`s.
  +
  Args:
  serialized: A scalar (0-D Tensor) of type string, a single binary
  serialized `SequenceExample` proto.
  