minor symfony#26195 [Serializer] remove unneeded php doc line (Simperfit)

This PR was merged into the 4.0 branch.

Discussion
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[Serializer] remove unneeded php doc line

| Q             | A
| ------------- | ---
| Branch?       | 4.0
| Bug fix?      | no
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | not needed

This is just a little cleaning of the uneeded doc blocks.

Commits
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bbcaaef [Serializer] remove unneeded php doc line

Author: nicolas-grekas

src/Symfony/Component/Serializer/Encoder/XmlEncoder.php

@@ -41,8 +41,7 @@ class XmlEncoder implements EncoderInterface, DecoderInterface, NormalizationAwa
     /**
      * Construct new XmlEncoder and allow to change the root node element name.
      *
-     * @param string   $rootNodeName
-     * @param int|null $loadOptions  A bit field of LIBXML_* constants
+     * @param int|null $loadOptions A bit field of LIBXML_* constants
      */
     public function __construct(string $rootNodeName = 'response', int $loadOptions = null)
     {
@@ -346,7 +345,6 @@ private function parseXmlValue(\DOMNode $node, array $context = array())
     /**
      * Parse the data and convert it to DOMElements.
      *
-     * @param \DOMNode     $parentNode
      * @param array|object $data
      *
      * @throws NotEncodableValueException
@@ -412,7 +410,6 @@ private function buildXml(\DOMNode $parentNode, $data, string $xmlRootNodeName =
     /**
      * Selects the type of node to create and appends it to the parent.
      *
-     * @param \DOMNode     $parentNode
      * @param array|object $data
      */
     private function appendNode(\DOMNode $parentNode, $data, string $nodeName, string $key = null): bool
@@ -441,8 +438,7 @@ private function needsCdataWrapping(string $val): bool
     /**
      * Tests the value being passed and decide what sort of element to create.
      *
-     * @param \DOMNode $node
-     * @param mixed    $val
+     * @param mixed $val
      *
      * @throws NotEncodableValueException
      */