GitHub URLs are not case sensitive

[ewels]

The example also needed updating. Instead of removing the example completely, I changed it to just show it fixing a spelling mistake (the other topic under the heading).

Why:

Closes: #34573

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

The docs mention that GitHub git remotes are case sensitive, which is not true.

I removed the part saying that they are case sensitive, and updated the example so that it fixes an actual spelling mistake (cocoareactive instead of ReactiveCocoa):

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Source	Preview	Production	What Changed
repositories/creating-and-managing-repositories/troubleshooting-cloning-errors.md	fpt ghec ghes@ 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 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]

@ewels Thank you very much for the fix! Updating the example to fix a spelling mistake is wonderfully clever, thank you ✨

This repo is currently in a code freeze, but we will get this merged as soon as the freeze ends on 9/16! 🍏

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