Don't install `pytorch-quantization` in Doc Builder docker file
Author: ydshieh
Pull request: yes

# What does this PR do?

Doc builder docker image build starts to fail with

```
The package you are trying to install is only a placeholder project on PyPI.org repository.
This package is hosted on NVIDIA Python Package Index.
  
This package can be installed as:

$ pip install --no-cache-dir --extra-index-url https://pypi.nvidia.com/ pytorch-quantization
```

I tried to install it with the suggested command, but the doc build step will fail with some cuda libary issue.
(when building `transformers/docs/source/en/model_doc/qdqbert.md`)

**I removed the line that installs `pytorch-quantization` and doc build can pass (and docker image built).**

Comments:
_The documentation is not available anymore as the PR was closed or merged._

For the record, here is the issue when running the suggested installation command: at **the doc build time**

```
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/transformers/utils/import_utils.py", line 1282, in _get_module
    return importlib.import_module("." + module_name, self.__name__)
  File "/usr/local/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 843, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/local/lib/python3.8/site-packages/transformers/models/qdqbert/modeling_qdqbert.py", line 60, in <module>
    from pytorch_quantization import nn as quant_nn
  File "/usr/local/lib/python3.8/site-packages/pytorch_quantization/__init__.py", line 20, in <module>
    from .quant_modules import *
  File "/usr/local/lib/python3.8/site-packages/pytorch_quantization/quant_modules.py", line 23, in <module>
    from pytorch_quantization import nn as quant_nn
  File "/usr/local/lib/python3.8/site-packages/pytorch_quantization/nn/__init__.py", line 19, in <module>
    from pytorch_quantization.nn.modules.tensor_quantizer import *
  File "/usr/local/lib/python3.8/site-packages/pytorch_quantization/nn/modules/tensor_quantizer.py", line 24, in <module>
    from pytorch_quantization.tensor_quant import QuantDescriptor, tensor_quant, fake_tensor_quant, scaled_e4m3
  File "/usr/local/lib/python3.8/site-packages/pytorch_quantization/tensor_quant.py", line 28, in <module>
    from pytorch_quantization import cuda_ext
ImportError: libcudart.so.11.0: cannot open shared object file: No such file or directory

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/doc_builder/build_doc.py", line 197, in build_mdx_files
    content, new_anchors, source_files, errors = resolve_autodoc(
  File "/usr/local/lib/python3.8/site-packages/doc_builder/build_doc.py", line 123, in resolve_autodoc
    doc = autodoc(
  File "/usr/local/lib/python3.8/site-packages/doc_builder/autodoc.py", line 474, in autodoc
    obj = find_object_in_package(object_name=object_name, package=package)
  File "/usr/local/lib/python3.8/site-packages/doc_builder/autodoc.py", line 39, in find_object_in_package
    submodule = getattr(module, split, None)
  File "/usr/local/lib/python3.8/site-packages/transformers/utils/import_utils.py", line 1273, in __getattr__
    value = getattr(module, name)
  File "/usr/local/lib/python3.8/site-packages/transformers/utils/import_utils.py", line 1272, in __getattr__
    module = self._get_module(self._class_to_module[name])
The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/bin/doc-builder", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.8/site-packages/doc_builder/commands/doc_builder_cli.py", line 47, in main
    args.func(args)
  File "/usr/local/lib/python3.8/site-packages/doc_builder/commands/build.py", line 102, in build_command
    build_doc(
  File "/usr/local/lib/python3.8/site-packages/doc_builder/build_doc.py", line 365, in build_doc
    anchors_mapping, source_files_mapping = build_mdx_files(
  File "/usr/local/lib/python3.8/site-packages/doc_builder/build_doc.py", line 230, in build_mdx_files
    raise type(e)(f"There was an error when converting {file} to the MDX format.\n" + e.args[0]) from e
RuntimeError: There was an error when converting transformers/docs/source/en/model_doc/qdqbert.md to the MDX format.
Failed to import transformers.models.qdqbert.modeling_qdqbert because of the following error (look up to see its traceback):
libcudart.so.11.0: cannot open shared object file: No such file or directory

```

Thanks Yih-Dar!