minor #16778 [Form] Fix an inversion between object and class (trandbert37)

This PR was merged into the 4.4 branch.

Discussion
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[Form] Fix an inversion between object and class

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Commits
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4384ab3 [Form] Fix an inversion between object and class

Author: javiereguiluz

form/embedded.rst

@@ -15,7 +15,7 @@ Embedding a Single Object
 -------------------------
 
 Suppose that each ``Task`` belongs to a ``Category`` object. Start by
-creating the ``Category`` object::
+creating the ``Category`` class::
 
     // src/Entity/Category.php
     namespace App\Entity;