Doc: improve docs about pg_statistic_ext_data.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e4d050e5f7b2c56ddd7659f843280e2fccb1d3ef
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-10-06T18:14:45Z
Releases: 12.1
Doc: improve docs about pg_statistic_ext_data.

Commit aa087ec64 was a bit over-hasty about the doc changes needed
while splitting pg_statistic_ext_data off from pg_statistic_ext.
It duplicated one para and inserted another in what seems to me
to be the wrong section.  Fix that up, and in passing do some minor
copy-editing.

Per report from noborusai.

Discussion: https://postgr.es/m/CAAM3qnLXLUz4mOBkqa8jxigpKhKNxzSuvwpjvCRPvO5EqWjxSg@mail.gmail.com

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doc/src/sgml/catalogs.sgml modified +21 −27

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