[issue45217] ConfigParser does not accept "No value" reversely to the doc

[Nikita Sobolev]

Nikita Sobolev <mail at sobolevn.me> added the comment:

Try this:

```
from configparser import ConfigParser
ConfigParser(allow_no_value=True).read('bug.ini')
```

It should work! :)

But, the docs are missing this config value here (which caused this issue):

> Values can be omitted, in which case the key/value delimiter may also be left out.

https://github.com/python/cpython/blame/f4b94b1f57827083990272b5f282aa1493ae2bf4/Doc/library/configparser.rst#L264

I will update the docs.

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nosy: +sobolevn

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45217>
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