Autonumbering nested lists

[bradley...@gmail.com]

This question was asked in a similar from in 2013 and no one replied; see
https://groups.google.com/g/sphinx-users/c/Sa8MpXdAQeM/m/TT5DyfwL8O8J

The  input
```
#. Paragraph one

   #. Line one.one
   #. Line one.two

#. Paragraph two

   #. Line two.one
   #. Line two.two

```
results in the display
```

1. Paragraph one
   1. Line one.one
   2. Line one.two
2. Paragraph two
   1. Line two.one
   2. Line two.two
```

How can I get automatic nested lables, so that Line one.one is labeled 1.1 etc.