Change list item indent from `tab` (size) to `one`

[wooorm]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Problem

While one is used more by authors, historically there have been problems when using it across parsers, hence why the default is tab.

Solution

To illustrate, one:

1. asd
10. asdasd
100. asdasdasd

* asd
* asdasd
* asdasdasd

tab:

1.  asd
10. asdasd
100.    asdasdasd

*   asd
*   asdasd
*   asdasdasd

Note that tab is more consistent. Especially around the 1st and 10th mark of incrementally numbered items. And the 100th, 1kth, 10kth items. Whereas one will always be staggered. It’s probably most common to have lists between 1-99 items, hence I deem that most important.
This is mostly noticeable when trying to indent further lines: they have to match the items “bullet” \d+[\.)]\ {1,4}.

Still, one seems to be used more? So probably good to switch the default output format to that?

Alternatives

stay as is

[Murderlon]

From how I've seen people write markdown, I've almost never seen them use tab, and I personally always set it to one too. That's of course a small sample size but my two cents is that this change makes sense.

[wooorm]

yeah, same!

[github-actions]

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