minor #10759 Update typo inside findAllGreaterThanPrice method in Databases and the Doctrine ORM (svjp)

This PR was submitted for the 4.2 branch but it was merged into the 4.1 branch instead (closes #10759).

Discussion
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Update typo inside findAllGreaterThanPrice method in Databases and the Doctrine ORM

Hello everyone 😄,

I realized that the `findAllGreaterThanPrice()` does not use the `$price` parameter that it receives in the method example.

Then I thought maybe someone just didn't notice it while writing the docs, why not fix it right? I think it could generate some confusion.

Cheers!

Commits
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16e5b3e Update doctrine.rst

Author: xabbuh

doctrine.rst

@@ -675,7 +675,7 @@ In addition to the query builder, you can also query with `Doctrine Query Langua
             FROM App\Entity\Product p
             WHERE p.price > :price
             ORDER BY p.price ASC'
-        )->setParameter('price', 1000);
+        )->setParameter('price', $price);
 
         // returns an array of Product objects
         return $query->execute();
@@ -696,7 +696,7 @@ Or directly with SQL if you need to::
             ORDER BY p.price ASC
             ';
         $stmt = $conn->prepare($sql);
-        $stmt->execute(['price' => 1000]);
+        $stmt->execute(['price' => $price]);
 
         // returns an array of arrays (i.e. a raw data set)
         return $stmt->fetchAll();