fix missed code-blocks because of syntax error (#1496)

[9bow]

Related Issue

Some code-blocks are missing because of reST syntax error (#1496)

What would change

I fixed 8 code-blocks around 6 tutorials.

What I fixed is as below list:

Tutorial	Source
Extending dispatcher for a new backend in C++	code-block after To create a Tensor on PrivateUse1 backend, you need to set dispatch key in TensorImpl constructor.
Making Native Android Application that uses PyTorch prebuilt libraries	code-block after You should see logs with tag ‘PyTorchNativeApp’ that prints x, y, and the result of the model forward, which we print with log function in NativeApp/app/src/main/cpp/pytorch_nativeapp.cpp.
(prototype) FX Graph Mode Post Training Static Quantization	code-block after The FX Graph Mode API looks like the following:
Hyperparameter tuning with Ray Tune	code-block after If you run the code, an example output could look like this:
Dynamic Parallelism in TorchScript	code-block after Let’s use the profiler along with the Chrome trace export functionality to visualize the performance of our parallelized model:
Extending TorchScript with Custom C++ Operators	code-block after At this point, we should be able to build the application:, code-block after And run it without passing a model just yet:, AND code-block after If we then pass this serialized model to our C++ application, we can run it straight away:

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[9bow]

Below are sample screenshots to check changes on 'Extending TorchScript with Custom C++ Operators' tutorial:

AS-IS (LINK)

TO-BE (LINK)

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