minor #20983 Fix a list item in object_mapper.rst (jdreesen)

This PR was merged into the 7.3 branch.

Discussion
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Fix a list item in object_mapper.rst

I'm not sure if this is the correct fix, but I'm trying to fix this strange looking list item:
https://symfony.com/doc/7.3/object_mapper.html#configuring-property-mapping

![grafik](https://github.com/user-attachments/assets/9f6ed8ec-8c13-4915-b46e-f114ca8b8170)

Commits
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0d4b755 Try fixing a list in object_mapper.rst

Author: xabbuh

object_mapper.rst

@@ -149,7 +149,7 @@ You can apply the ``#[Map]`` attribute to properties to customize their mapping
 
 * ``target``: Specifies the name of the property in the target object;
 * ``source``: Specifies the name of the property in the source object (useful
-    when mapping is defined on the target, see below);
+  when mapping is defined on the target, see below);
 * ``if``: Defines a condition for mapping the property;
 * ``transform``: Applies a transformation to the value before mapping.