Fix invalid namespace in phpdoc (\PHP_CodeSniffer\Files\File)

[mzk]

The invalid phpdoc namespace fixed.

Description

Suggested changelog entry

Related issues/external references

Fixes #

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
  • [ ] This change is only breaking for integrators, not for external standards or end-users.
• [ ] Documentation improvement

PR checklist

• [x] I have checked there is no other PR open for the same change. (https://github.com/squizlabs/PHP_CodeSniffer/pull/3256 similar)
• [ ] I have read the Contribution Guidelines.
• [ ] I grant the project the right to include and distribute the code under the BSD-3-Clause license (and I have the right to grant these rights).
• [ ] I have added tests to cover my changes.
• [ ] I have verified that the code complies with the projects coding standards.
• [ ] [Required for new sniffs] I have added XML documentation for the sniff.
• [ ] [Required for new files] I have added any new files to the package.xml file.

[mzk]

@jrfnl Done, thx.

[jrfnl]

FYI: this fix is included in today's PHP_CodeSniffer 3.8.0 release.

As per #3932, development on PHP_CodeSniffer will continue in the PHPCSStandards/PHP_CodeSniffer repository. If you want to stay informed, you may want to start "watching" that repo (or watching releases from that repo).