minor #12770 [Documentation] One more fix for warning about version o…

…f Sylius in Plus installation guide (GSadee)

This PR was merged into the 1.9 branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Branch?         | 1.9
| Bug fix?        | yes
| New feature?    | no
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | after #12767 
| License         | MIT

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Commits
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f25861d [Documentation] One more fix for warning about version of Sylius in Plus installation guide

docs/book/installation/sylius_plus_installation.rst

@@ -70,11 +70,11 @@ Installing Sylius Plus as a plugin to a Sylius application
     Recommended Sylius version to use with Sylius Plus is 1.10. If, for any reason, you need to use Sylius 1.9, it's required
     to customise some API configurations. Run the following commands, to do it:
 
-.. code-block:: bash
+    .. code-block:: bash
 
-    rm vendor/sylius/plus/src/Resources/config/api_resources/Shipment.xml
-    mkdir config/api_platform/
-    cp -R vendor/sylius/plus/etc/sylius-1.9/Resources/config/api_resources/* config/api_platform/
+        rm vendor/sylius/plus/src/Resources/config/api_resources/Shipment.xml
+        mkdir config/api_platform/
+        cp -R vendor/sylius/plus/etc/sylius-1.9/Resources/config/api_resources/* config/api_platform/
 
 **5.** Configure Shop, Admin and Admin API routing: