users-guide: Correct markdown for ghc-9.2
This patch corrects some markdown.
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Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template
This patch corrects some markdown.
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