message: Fix formatting problems.
diff: @@ -178,9 +178,7 @@ suggested implementation is to:
  file, but the specialization for the GPUDevice is defined in a .cu.cc file,
  since it will be compiled with the CUDA compiler.
  -<!--zippy-->
  -
  -Expand this to see the example implementation.
  +Here is an example implementation.
  ```c++
  // example.h
  @@ -307,8 +305,6 @@ template struct ExampleFunctor<GPUDevice, int32>;
  #endif // GOOGLE_CUDA
  ```
  -<!--endzippy-->
  -
  ## Build the op library
  ### Compile the op using your system compiler (TensorFlow binary installation)
  @@ -763,7 +759,7 @@ Your op registration now specifies that the input's type must be `float`, or
  > """
  > ```
  -<pre><pre class="prettyprint"><code class="lang-cpp">
  +<pre class="prettyprint"><code class="lang-cpp">
  \#include "tensorflow/core/framework/op_kernel.h"<br/>
  class ZeroOut<b>Int32</b>Op : public OpKernel {
  // as before
  @@ -803,7 +799,7 @@ REGISTER\_KERNEL\_BUILDER(
  .Device(DEVICE\_CPU)
  .TypeConstraint&lt;float&gt;("T"),
  ZeroOutFloatOp);
  -</b></code></pre></pre>
  +</b></code></pre>
  > To preserve [backwards compatibility](#backwards-compatibility), you should
  > specify a [default value](#default-values-constraints) when adding an attr to
  