Improve documentation of pageinspect

Michael Paquier <michael@paquier.xyz>

Commit: 1fb2d78cb94672f4cfc0c1a2da9e0a534e3698f2
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-08-23T11:41:22Z
Releases: 10.11
Improve documentation of pageinspect

This adds a section for heap-related functions.  These were previously
mixed with functions having a more general purpose, leading to
confusion.  While on it, add a query example for fsm_page_contents.

Backpatch down to 10, where b5e3942 introduced the subsections for
function types in pageinspect documentation.

Author: Masahiko Sawada
Discussion: https://postgr.es/m/CAD21AoDyM7E1+cK3-aWejxKTGC-wVVP2B+RnJhN6inXyeRmqzw@mail.gmail.com
Backpatch-through: 10

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doc/src/sgml/pageinspect.sgml modified +33 −23

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