Rework some error strings for REINDEX CONCURRENTLY with system catalogs

Michael Paquier <michael@paquier.xyz>

Commit: 20e1cc898da6f82b5680973c107e8a96d46caf01
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-06-20T04:28:12Z
Releases: 12.0
Rework some error strings for REINDEX CONCURRENTLY with system catalogs

This makes the whole user experience more consistent when bumping into
failures, and more in line with the rewording done via 508300e.

Author: Michael Paquier
Reviewed-by: Álvaro Herrera
Discussion: https://postgr.es/m/20190514153252.GA22168@alvherre.pgsql

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