Docs: Add a `@since` note about the `$srcset` and `$sizes` attributes added to `wp_get_attachment_image()`.

Follow-up to [34855].

See #51122.
Built from https://develop.svn.wordpress.org/trunk@48853


git-svn-id: http://core.svn.wordpress.org/trunk@48615 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -1002,6 +1002,7 @@ function wp_get_attachment_image_src( $attachment_id, $size = 'thumbnail', $icon
  * browser scale down the image.
  *
  * @since 2.5.0
+ * @since 4.4.0 The `$srcset` and `$sizes` attributes were added.
  * @since 5.5.0 The `$loading` attribute was added.
  *
  * @param int          $attachment_id Image attachment ID.

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-48852';
+$wp_version = '5.6-alpha-48853';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.