Media: Improve docs for `image_send_to_editor` filter.

This updates inline docs for the `image_send_to_editor` filter to better
describe when it is fired.

Props adamsilverstein.
Fixes #34823.
Built from https://develop.svn.wordpress.org/trunk@38734


git-svn-id: http://core.svn.wordpress.org/trunk@38677 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/media.php

@@ -135,7 +135,7 @@ function get_image_send_to_editor( $id, $caption, $title, $align, $url = '', $re
 		$html = '<a href="' . esc_attr( $url ) . '"' . $rel . '>' . $html . '</a>';
 
 	/**
-	 * Filters the image HTML markup to send to the editor.
+	 * Filters the image HTML markup to send to the editor when inserting an image.
 	 *
 	 * @since 2.5.0
 	 *

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38733';
+$wp_version = '4.7-alpha-38734';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.