minor #19327 [Yaml] Fix PHPDoc of the Yaml class (dunglas)

This PR was squashed before being merged into the 2.7 branch (closes #19327).

Discussion
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[Yaml] Fix PHPDoc of the Yaml class

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

The YAML dumper is able to serialize any PHP type, not just arrays.

Commits
-------

a3fd991 [Yaml] Fix PHPDoc of the Yaml class

src/Symfony/Component/Yaml/Yaml.php

@@ -73,20 +73,20 @@ public static function parse($input, $exceptionOnInvalidType = false, $objectSup
     }
 
     /**
-     * Dumps a PHP array to a YAML string.
+     * Dumps a PHP value to a YAML string.
      *
      * The dump method, when supplied with an array, will do its best
      * to convert the array into friendly YAML.
      *
-     * @param array $array                  PHP array
+     * @param mixed $input                  The PHP value
      * @param int   $inline                 The level where you switch to inline YAML
      * @param int   $indent                 The amount of spaces to use for indentation of nested nodes
      * @param bool  $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
      * @param bool  $objectSupport          true if object support is enabled, false otherwise
      *
-     * @return string A YAML string representing the original PHP array
+     * @return string A YAML string representing the original PHP value
      */
-    public static function dump($array, $inline = 2, $indent = 4, $exceptionOnInvalidType = false, $objectSupport = false)
+    public static function dump($input, $inline = 2, $indent = 4, $exceptionOnInvalidType = false, $objectSupport = false)
     {
         if ($indent < 1) {
             throw new \InvalidArgumentException('The indentation must be greater than zero.');
@@ -95,6 +95,6 @@ public static function dump($array, $inline = 2, $indent = 4, $exceptionOnInvali
         $yaml = new Dumper();
         $yaml->setIndentation($indent);
 
-        return $yaml->dump($array, $inline, 0, $exceptionOnInvalidType, $objectSupport);
+        return $yaml->dump($input, $inline, 0, $exceptionOnInvalidType, $objectSupport);
     }
 }