Summary:
Entity Documentation - minecraft:shareables contains incorrect information about singular_pickup parameter.
"singular_pickup" parameter is contained in the table of "items" parameter, however it should be in the same table as "items" parameter, since it does not belong to "items" parameter. An example of "singular_pickup" is given in vanilla skeleton behavior https://github.com/Mojang/bedrock-samples/blob/main/behavior_pack/entities/skeleton.json (line 283).
Also, the description of the "items" parameter says: "items is a list defined by eleven parameters. Each item has the following properties:" Although at the moment there are thirteen parameters in the table (there will be twelve after moving the "singular_pickup" parameter).

Steps to reproduce:

1. Open the page https://learn.microsoft.com/en-us/minecraft/creator/reference/content/entityreference/examples/entitycomponents/minecraftcomponent_shareables?view=minecraft-bedrock-stable#items
2. Find the "singular_pickup" parameter in the "items" table.

Observed results:
"singular_pickup" parameter is contained in the table of "items" parameter.

Expected results:
The parameter "singular_pickup" is contained in the main table "Parameters".