Docs: Add `@since` tag for the `$context` parameter added to `wp_generate_attachment_metadata` filter in [46621].

See #48472.
Built from https://develop.svn.wordpress.org/trunk@46622


git-svn-id: http://core.svn.wordpress.org/trunk@46419 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/image.php

@@ -592,6 +592,7 @@ function wp_generate_attachment_metadata( $attachment_id, $file ) {
 	 * Filters the generated attachment meta data.
 	 *
 	 * @since 2.1.0
+	 * @since 5.3.0 The `$context` parameter was added.
 	 *
 	 * @param array  $metadata      An array of attachment meta data.
 	 * @param int    $attachment_id Current attachment ID.

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-46621';
+$wp_version = '5.4-alpha-46622';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.