chore: change blocks to block entities as PDC holder

Author: olijeffers0n

docs/paper/dev/api/pdc.mdx

@@ -5,7 +5,7 @@ description: A guide to the PDC API for storing data.
 
 # Persistent Data Container (PDC)
 
-The Persistent Data Container (PDC) is a way to store custom data on a whole range of objects; such as items, entities, and blocks.
+The Persistent Data Container (PDC) is a way to store custom data on a whole range of objects; such as items, entities, and block entities.
 The full list of classes that support the PDC are:
 
 - [`Chunk`](#chunk)