doc: Spell I/O consistently

Michael Paquier <michael@paquier.xyz>

Commit: 1f61680327c962d5bafdbf6a04ad9bb0f7232f92
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-02-06T04:29:22Z
Releases: 17.0
doc: Spell I/O consistently

The pg_stat_io and pg_stat_copy_progress view docs spelled "I/O" as "IO"
or even "io" in some places when not referring to literal names or
string values.

Author: Dagfinn Ilmari Mannsåker
Discussion: https://postgr.es/m/87fry6lx5s.fsf@wibble.ilmari.org

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doc/src/sgml/monitoring.sgml modified +3 −3

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