Doc: Update documentation on partitioning vs. foreign tables.

Etsuro Fujita <efujita@postgresql.org>

Commit: 3e6b0c472942e9a73e0fc10659dce2cba56959a7
Author: Etsuro Fujita <efujita@postgresql.org>
Date: 2019-04-05T11:55:06Z
Releases: 12.0
Doc: Update documentation on partitioning vs. foreign tables.

The limitations that it is not allowed to create/attach a foreign table
as a partition of an indexed partitioned table were not documented.

Reported-By: Stepan Yankevych
Author: Etsuro Fujita
Reviewed-By: Amit Langote
Backpatch-through: 11 where partitioned index was introduced
Discussion: https://postgr.es/m/1553869152.858391073.5f8m3n0x@frv53.fwdcdn.com

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