Reword partitioning error message

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: f669ba7bdb009c0ed5335aedc632c928c97b38af
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2020-09-30T21:25:23Z
Releases: 12.5
Reword partitioning error message

The error message about columns in the primary key not including all of
the partition key was unclear; reword it.

Backpatch all the way to pg11, where it appeared.

Reported-by: Nagaraj Raj <nagaraj.sf@yahoo.com>
Discussion: https://postgr.es/m/64062533.78364.1601415362244@mail.yahoo.com

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