This is to avoid having unescaped inputs wreaking havoc internally like in the Windows workflow, for example, https://github.com/pytorch/pytorch/runs/7438650352

The issue is triggered by the PR body in https://github.com/pytorch/pytorch/pull/81755, so I copy the body below to test this fix. The Windows test workflow should pass instead of failing with the cryptic `> was unexpected at this time` error message and a 255 exit error code.

TESTING PR BODY BELOW:

### The problem

This original regex abuses .* in combination with `re.DOTALL` and leads to a catastrophic backtracking perf issue when there is no match. When it happens, test_doc_template will run "forever" and timeout. Here is an example timeout test https://github.com/pytorch/pytorch/runs/7413337595

Another minor issue with this regex is that it won't matches concatenated doc string like `"""FOO""" + """BAR"""`, which is used for some API `_torch_docs.py`

### The fix
* Remove most of the match all .* usage. I have tested to make sure that the test finishes even when there is no match, i.e. it fails successfully
* Update the regex to match all the following cases before and after linting (You can also try it out on https://pythex.org):

BEFORE
```
add_docstr(torch.abs, r"""
abs(input, *, out=None) -> Tensor

Computes the absolute value of each element in :attr:`input`.

.. math::
    \text{out}_{i} = |\text{input}_{i}|
""" + r"""
Args:
    {input}

Keyword args:
    {out}

Example::

    >>> torch.abs(torch.tensor([-1, -2, 3]))
    tensor([ 1,  2,  3])
""".format(**common_args))

add_docstr(torch.absolute,
           r"""
absolute(input, *, out=None) -> Tensor

Alias for :func:`torch.abs`
""")
```

AFTER
```
add_docstr(
    torch.abs,
    r"""
abs(input, *, out=None) -> Tensor

Computes the absolute value of each element in :attr:`input`.

.. math::
    \text{out}_{i} = |\text{input}_{i}|
"""
    + r"""
Args:
    {input}

Keyword args:
    {out}

Example::

    >>> torch.abs(torch.tensor([-1, -2, 3]))
    tensor([ 1,  2,  3])
""".format(
        **common_args
    ),
)

add_docstr(
    torch.absolute,
    r"""
absolute(input, *, out=None) -> Tensor

Alias for :func:`torch.abs`
""",
)
```

This will unblock https://github.com/pytorch/pytorch/pull/81643

Pull Request resolved: https://github.com/pytorch/pytorch/pull/81835
Approved by: https://github.com/janeyx99