6 string references to YAML keys in help_topics.routing.yml in Drupal 9

HelpBreadcrumbBuilder::applies in core/modules/help_topics/src/HelpBreadcrumbBuilder.php

Whether this breadcrumb builder should be used to build the breadcrumb.

HelpTopicPluginBase::toLink in core/modules/help_topics/src/HelpTopicPluginBase.php

Returns a link for viewing the help topic.

HelpTopicPluginBase::toUrl in core/modules/help_topics/src/HelpTopicPluginBase.php

Returns the URL for viewing the help topic.

HelpTopicPluginController::viewHelpTopic in core/modules/help_topics/src/Controller/HelpTopicPluginController.php

Displays a help topic page.

HelpTwigExtension::getTopicLink in core/modules/help_topics/src/HelpTwigExtension.php

Returns a link to a help topic, or the title of the topic.

help_topics_help in core/modules/help_topics/help_topics.module

Implements hook_help().