Add spacing for improved readability in 2-what-is-github.md

Author: PagelsR

learn-pr/github/introduction-to-github/includes/2-what-is-github.md

@@ -163,3 +163,5 @@ To learn more about how to create and manage gists, refer to the GitHub document
 Every repository on GitHub.com comes equipped with a section for hosting documentation, called a wiki. You can use your repository's wiki to share long-form content about your project, such as how to use it, how you designed it, or its core principles. While a README file quickly tells what your project can do, you can use a wiki to provide additional documentation.
 
 It’s worth a reminder that if your repository is private, only people who have at least read access to your repository will have access to your wiki.
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learn-pr/github/introduction-to-github/includes/4-collaborative-platform.md

@@ -97,3 +97,5 @@ Each category must have a unique name, emoji pairing, and a detailed description
 1. In your repository, go to the Discussions tab and select **Start discussion**.
 
 That covers a little about how GitHub supports collaborative work. Now let's move to how you can manage notifications, subscribe to threads, and get started with GitHub pages.
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learn-pr/github/search-organize-repository-history-github/6-knowledge-check.yml

@@ -10,7 +10,7 @@ metadata:
   ms.topic: unit
 durationInMinutes: 3
 content: |
-  [!include[](includes/4-knowledge-check.md)]
+  [!include[](includes/6-knowledge-check.md)]
 quiz:
   title: Check your knowledge
   questions: