Match method-name docblock descriptions containing articles

[TomasVotruba]

RemoveMethodNameDuplicateDescriptionFixer already strips trailing punctuation and handles getter/setter verb mix-ups, but a human-written description with an article (a/an/the) slipped through — the space-stripped line no longer matched the method name.

This drops article words (word-boundary matched, so theme etc. stay intact) before the comparison.

 final class ApiIntegration
 {
     /**
-     * Get the API helper.
-     *
      * @return object
      */
     public function getApiHelper()
     {
     }
 }

New fixture with_articles.php.inc covers it; existing cases (Set name, Set name., getter/setter mix-up) still pass.