fix(github): Fix docs typo and copy edit (#13877)

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Kinda rushed the first PR, edited the copy and removed some of the
unnecessary parts.

<img width="746" alt="image"
src="https://github.com/user-attachments/assets/2c10ca64-b21e-4c28-9348-77d1dd9f9bc1"
/>


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Author: leeandher

docs/organization/integrations/source-code-mgmt/github/index.mdx

@@ -5,14 +5,13 @@ description: "Learn more about Sentry's GitHub integration and how it can track
 ---
 
 There are two types of GitHub integrations, so make sure you're choosing the correct one:
-- [GitHub](#installing-github) - For most GitHub accounts, these will have URLs like `https://github.com/org-name`. **Most Github Enterprise Cloud customers should be able to use this integration. **Follow the '[Installing GitHub](#installing-github)' instructions, **do not use the GitHub Enterprise integration and please begin the installation from Sentry**.
-- [GitHub Enterprise](#installing-github-enterprise) - For GitHub Enterprise instances that **cannot be accessed from `https://github.com`**. For example, a custom domain:
+- [GitHub](#installing-github) - For individual GitHub users/organizations (as well as most GitHub Enterprise Cloud customers), so long as they are hosted on `github.com`. Follow the '[Installing GitHub](#installing-github)' instructions, **Please begin the installation from Sentry**.
+
+- [GitHub Enterprise](#installing-github-enterprise) - For GitHub Enterprise instances that **cannot be accessed from `github.com`**. Usually these will have a custom domain, for example:
   - `https://github.example.com`
   - `https://ghe.example.com/`
 
- For these accounts, and if your organization cannot access the [Sentry's GitHub App](https://github.com/apps/sentry-io) for whatever reason, follow the '[Installing GitHub Enterprise](#installing-github-enterprise)' instructions; it'll guide you through making your own GitHub App and allowing Sentry to use it for access to your organization. **Do not use the regular GitHub integration**.
-
-## Installing GitHub
+  For these accounts, follow the '[Installing GitHub Enterprise](#installing-github-enterprise)' instructions.
 
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