typo in sample nested list item markdown literal

[djbrown]

Why:

Sample test is 100. First list item, so the first five characters are 100. (point BEFORE space) not 100 . (point AFTER space).

Closes: -

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

https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#nested-lists

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Source	Preview	Production	What Changed
get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax.md	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9

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ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[nguyenalex836]

@djbrown Thanks so much for opening a PR with these fixes! I'll update the branch and get this merged once tests are passing 🍏

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