Tweak detail and hint messages to be consistent with project policy

Michael Paquier <michael@paquier.xyz>

Commit: 535f1fc9da728f5c692c96d5a4d635b43eeef7b7
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-07-20T00:50:57Z
Releases: 15.0
Tweak detail and hint messages to be consistent with project policy

Detail and hint messages should be full sentences and should end with a
period, but some of the messages newly-introduced in v15 did not follow
that.

Author: Justin Pryzby
Reviewed-by: Álvaro Herrera
Discussion: https://postgr.es/m/20220719120948.GF12702@telsasoft.com
Backpatch-through: 15

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