Rework grammar for REINDEX

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 83011ce7d7f42b744a93d2b0819597d0aa94e9cc
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-07-22T17:23:39Z
Releases: 16.0
Rework grammar for REINDEX

The part of grammar have grown needlessly duplicative and more complex
that necessary.  Rewrite.

Reviewed-by: Michaël Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/20220721174212.cmitjpuimx6ssyyj@alvherre.pgsql

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