minor #31878 Add a missing quote in PropertyAccessorInterface::getValue() DocBlock (juuuuuu)

This PR was merged into the 3.4 branch.

Discussion
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Add a missing quote in PropertyAccessorInterface::getValue() DocBlock

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

This typo is [here](1bae7b242c (diff-9814357bc1a81a8e3c8e38de9ccc69d0R63)) for almost 7 years now 😄
This won't change the face of the world, but it will be my first PR for Symfony.

Commits
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fd17ff005d Add a missing quote in getValue() DocBlock

src/Symfony/Component/PropertyAccess/PropertyAccessorInterface.php

@@ -58,7 +58,7 @@ interface PropertyAccessorInterface
      *
      *     $propertyAccessor = PropertyAccess::createPropertyAccessor();
      *
-     *     echo $propertyAccessor->getValue($object, 'child.name);
+     *     echo $propertyAccessor->getValue($object, 'child.name');
      *     // equals echo $object->getChild()->getName();
      *
      * This method first tries to find a public getter for each property in the