doc: clarify COPY TO for partitioning/inheritance

Bruce Momjian <bruce@momjian.us>

Commit: 9595b06ef7363bf6ca42906e0007a82ab5da0950
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-12-16T00:20:14Z
Releases: 10.16
doc:  clarify COPY TO for partitioning/inheritance

It was not clear how COPY TO behaved with partitioning/inheritance
because the paragraphs were so far apart.  Also reword to simplify.

Discussion: https://postgr.es/m/20201203211723.GR24052@telsasoft.com

Author: Justin Pryzby

Backpatch-through: 10

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doc/src/sgml/ref/copy.sgml modified +10 −14

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