Fix typo in example repo org name

[chrismear]

The typo was particularly confusing because it's in a note about how the organisation needs to be the same as another repo's organisation.

Why:

Closes: #35274

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

Fix a typo that resulted in an incorrect example repo org name.

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Source	Preview	Production	What Changed
codespaces/prebuilding-your-codespaces/allowing-a-prebuild-to-access-other-repositories.md	fpt ghec	fpt ghec

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ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[nguyenalex836]

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

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