Clarify phpdoc for the vertical and horizontal arguments to the flip() method in WP_Image_Editor*.

Props dh-shredder
fixes #23775


git-svn-id: https://develop.svn.wordpress.org/trunk@23750 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/class-wp-image-editor.php

@@ -144,8 +144,8 @@ abstract class WP_Image_Editor {
 	 * @access public
 	 * @abstract
 	 *
-	 * @param boolean $horz Horizontal Flip
-	 * @param boolean $vert Vertical Flip
+	 * @param boolean $horz Flip along Horizontal Axis
+	 * @param boolean $vert Flip along Vertical Axis
 	 * @return boolean|WP_Error
 	 */
 	abstract public function flip( $horz, $vert );