4 string references to YAML keys in block_content.routing.yml

BlockContentRouteProvider::getRoutes in core/modules/block_content/src/Routing/BlockContentRouteProvider.php
Provides routes for entities.
BlockContentTypeRouteProvider::getRoutes in core/modules/block_content/src/Routing/BlockContentTypeRouteProvider.php
Provides routes for entities.
BlockContentTypeTest::testBlockContentTypeEditing in core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php
Tests editing a block type using the UI.
claro_preprocess_block_content_add_list in core/themes/claro/claro.theme
Implements template_preprocess_HOOK() for block_content_add_list.

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