Themes: Document the new theme features being added.

The add_theme_support() inline docs now includes the features that the block editor adds.

Props pento, desrosj.

Merges [43814] to trunk.

Fixes #45134.

git-svn-id: https://develop.svn.wordpress.org/trunk@44158 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/theme.php

@@ -2318,7 +2318,9 @@ function get_theme_starter_content() {
  * @since 4.1.0 The `title-tag` feature was added
  * @since 4.5.0 The `customize-selective-refresh-widgets` feature was added
  * @since 4.7.0 The `starter-content` feature was added
- * @since 5.0.0 The `responsive-embeds` feature was added.
+ * @since 5.0.0 The `responsive-embeds`, `align-wide`, `dark-editor-style`, `disable-custom-colors`,
+ *              `disable-custom-font-sizes`, `editor-color-pallete`, `editor-font-sizes`,
+ *              `editor-styles`, and `wp-block-styles` features were added.
  *
  * @global array $_wp_theme_features
  *