New tasklists also allow shorthand syntax

[HonkingGoose]

Why:

@omerbensaadon is a PM with GitHub, they said that the new tasklist feature also accepts #45 shorthand-syntax. The current docs say you must use the full URL like this: https://github.com/octo-org/octo-repo/issues/45

Fixes a part of issue #24862. It should not close the issue as more work is needed after my PR gets merged. 😉

What's being changed (if available, include any code snippets, screenshots, or gifs):

Rewrite a list item to allow both full URL and shorthand syntax, with examples of both.

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Source	Preview	Production	What Changed
issues/tracking-your-work-with-issues/about-tasklists.md	fpt ghec	fpt ghec

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[cmwilson21]

👋 Hey @HonkingGoose - great to have another contribution from you 🎉

I'll get this triaged for review! ⚡

[HonkingGoose]

While you guys are triaging my change, also check if other parts of the document need to be changed as well. For example there's an example that only shows the full URL, and no shorthand-syntax:

Your finished tasklist should look like this:

```[tasklist]
### My tasks
- [ ] https://github.com/octo-org/octo-repo/issues/45
- [ ] Draft issue title
```

I could add a line like this to the [tasklist] above, to explain that shorthand-syntax is also allowed:

- [ ] #45 Shorthand-syntax is also allowed

Also I don't know if shorthand-syntax is the correct term for the "short URLs". 😄

[omerbensaadon]

Thank you for your contribution @HonkingGoose

[guntrip]

Thanks so much for adding this, @HonkingGoose! I'll get this merged shortly and make sure we include this in future iterations of these docs.

[HonkingGoose]

@stevecat before you merge, did you check if you want to update the [tasklist] example on line 55 through 61? Maybe that example should also show the shorthand-syntax?

[guntrip]

@HonkingGoose Thanks for the reminder! ✨ I think we'll keep this as the optional step in the procedural for now. I think the example is super clear at the moment.

[HonkingGoose]

That's okay! Thanks for merging my contribution! 😄

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