minor #25881 [VarDumper] Fix docblock (chalasr)

This PR was merged into the 2.7 branch.

Discussion
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[VarDumper] Fix docblock

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

Commits
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36cd267590 [VarDumper] Fix docblock

src/Symfony/Component/VarDumper/Dumper/AbstractDumper.php

@@ -114,9 +114,9 @@ abstract class AbstractDumper implements DataDumperInterface, DumperInterface
     /**
      * Sets the indentation pad string.
      *
-     * @param string $pad A string the will be prepended to dumped lines, repeated by nesting level
+     * @param string $pad A string that will be prepended to dumped lines, repeated by nesting level
      *
-     * @return string The indent pad
+     * @return string The previous indent pad
      */
     public function setIndentPad($pad)
     {