Improve a couple of error messages.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 54315fde73915a2468eaa22a2fa38927a23ac4ec
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2026-01-03T22:18:39Z
Improve a couple of error messages.

Change "function" to "function or procedure" in
PreventInTransactionBlock, and improve grammar of ExecWaitStmt's
complaint about having an active snapshot.

Author: Pavel Stehule <pavel.stehule@gmail.com>
Reviewed-by: Andreas Karlsson <andreas@proxel.se>
Reviewed-by: Marcos Pegoraro <marcos@f10.com.br>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAFj8pRCveWPR06bbad9GnMb0Kcr6jnXPttv9XOaOB+oFCD1Tsg@mail.gmail.com

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