Michael Paquier 58597edea1 doc: Simplify description of functions for pg_walinspect
As introduced in 2258e76, the docs were hard to parse:
- The examples used listed a lot of long records, bloating the output.
These are switched to show less records with the expanded format,
similarly to pageinspect.
- The function descriptions listed all the OUT parameters, producing
long lines.  This is updated so as only the input parameters are
documented, clarifying the whole.
- Remove one example on pg_get_wal_stats() when per_record is set to
true, which is not really necessary once we know the output produced,
and the behavior of the parameter is documented.

While on it, fix a few grammar mistakes and simplify a couple of
sentences.

Author: Bharath Rupireddy
Discussion: https://postgr.es/m/CALj2ACVGcUpziGgQrcT-1G3dHWQQfWjYBu1YQ2ypv9y86dgogg@mail.gmail.com
Backpatch-through: 15
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PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.
Description
he World's Most Advanced Open Source Relational Database.
Readme 742 MiB
Languages
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PLpgSQL 5.9%
Perl 4.4%
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Other 2.2%