Fix typo: 'practise' to 'practice'

[Bgiangiordano]

Corrected a small typo. Sorry, I had to do it for pull request practice!

Why: Typo fix

Closes:

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

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
get-started/start-your-journey/hello-world.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[nguyenalex836]

@Bgiangiordano No apologies needed! Thanks so much for opening a PR with this fix ✨ I'll update the branch and get this merged once tests are passing 🍏

Feel free to take a look at some of our good first issues if you want more practice 💛

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