https://api.drupal.org/api/drupal/core%21modules%21help%21help.services.yml/service/plugin.manager.help_section/11.x
plugin.manager.help_section | Drupal API
plugin manager helpsectiondrupalapi
https://api.drupal.org/api/drupal/core%21modules%21help%21help.services.yml/service/plugin.manager.help_topic/11.x
plugin.manager.help_topic | Drupal API
plugin manager helptopicdrupalapi