minor #4928 Change installation method order (ifdattic)

This PR was submitted for the 2.4 branch but it was merged into the 2.5 branch instead (closes #4928).

Discussion
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Change installation method order

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.4
| Fixed tickets |

Commits
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1db39c2 Update introduction.rst
475be21 Change installation method order

components/debug/introduction.rst

@@ -16,8 +16,8 @@ Installation
 
 You can install the component in many different ways:
 
-* Use the official Git repository (https://github.com/symfony/Debug);
-* :doc:`Install it via Composer </components/using_components>` (``symfony/debug`` on `Packagist`_).
+* :doc:`Install it via Composer </components/using_components>` (``symfony/debug`` on `Packagist`_);
+* Use the official Git repository (https://github.com/symfony/Debug).
 
 Usage
 -----