Issue #2975451 by Jaypan: Incorrect reference in StreamWrapperInterface.php description

(cherry picked from commit 3c5bf74b)

core/lib/Drupal/Core/StreamWrapper/StreamWrapperInterface.php

@@ -6,7 +6,7 @@
  * Defines a Drupal stream wrapper extension.
  *
  * Provides a Drupal interface and classes to implement PHP stream wrappers for
- * public, private, and temporary files. Extends the StreamWrapperInterface
+ * public, private, and temporary files. Extends the PhpStreamWrapperInterface
  * with methods expected by Drupal stream wrapper classes.
  *
  * A stream wrapper is an abstraction of a file system that allows Drupal to