Fix links, fixes #2189

Author: texnixe

content/docs/3_reference/7_plugins/1_extensions/0_blocks/reference-extension.txt

@@ -327,6 +327,6 @@ fields:
 
 ## Further reading
 
-- (link: docs/cookbook/panel/custom-block-type text: Recipe: Creating a custom block type from scratch)
-- (link: docs/cookbook/panel/block-collection text: Recipe: Block factory: Creating your own blocks collection)
+- (link: docs/guide/page-builder/custom-block-type text: Recipe: Creating a custom block type from scratch)
+- (link: docs/guide/page-builder/block-examples text: Recipe: Block factory: Creating your own blocks collection)
 - (link: docs/cookbook/panel/nested-blocks text: Recipe: Nested blocks)