Consistently use read-only instead of "read only"

Magnus Hagander <magnus@hagander.net>

Commit: d6c916f020e291b45563d4e76a649e9364cb6f2d
Author: Magnus Hagander <magnus@hagander.net>
Date: 2021-09-07T20:04:39Z
Releases: 15.0
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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