message: Docs: Clarify using_tpu.md
diff: @@ -280,8 +280,8 @@ Where `params['batch-size']` will contain the batch size.
  ### Static shapes and batch size
  The input pipeline generated by your `input_fn` is run on CPU. So it is mostly
  -free strict static shape requirements imposed by the XLA/TPU environment. The
  -one requirement is that the batches of data fed from your input pipeline to
  +free from the strict static shape requirements imposed by the XLA/TPU environment.
  +The one requirement is that the batches of data fed from your input pipeline to
  the TPU have a static shape, as determined by the standard TensorFlow shape
  inference algorithm. Intermediate tensors are free to have a dynamic shapes.
  If shape inference has failed, but the shape is known it is possible to
  