doc: Improve tableoid description

Peter Eisentraut <peter@eisentraut.org>

Commit: a47834db0fb70256e676862f1d96374a9e114d82
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-11-21T07:26:20Z
Releases: 14.0
doc: Improve tableoid description

Mention that it's useful for determining table names for partitioned
tables as well as for those in inheritance hierarchies.

Author: Ian Lawrence Barwick <barwick@gmail.com>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAB8KJ=gFmBXP=P9htziOj+WM5PDAK4qc7iGQta+8kUh306kQnw@mail.gmail.com

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