Consistently use read-only instead of "read only"

Magnus Hagander <magnus@hagander.net>

Commit: b7fd291042a846b04439f122cb81a41d3cd2e8de
Author: Magnus Hagander <magnus@hagander.net>
Date: 2021-09-07T20:04:45Z
Releases: 14.0
Consistently use read-only instead of "read only"

This affects one message and some documentation that used the format
"read only", unlike everything else that used read-only.

Backpatch-through: 14
Discussion: https://postgr.es/m/CABUevExuxKwn0YM3+wdSeQSvK6CRrJ-hewocGVX3R4-xVX4eMw@mail.gmail.com

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