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Clarify how special wal_sender_shutdown_timeout values affect shutdown waiting. A value of -1 disables the shutdown timeout and lets the WAL sender wait for the receiver to catch up, while 0 causes immediate termination without waiting for catch-up. Positive values bound how long shutdown waits, so document that they should be high enough for WAL data to be replicated under normal circumstances. Update the main documentation, the GUC long description, and postgresql.conf.sample consistently. While here, fix nearby paragraph indentation and spacing. Backpatch to v19, where wal_sender_shutdown_timeout was introduced. Author: Chao Li <lic@highgo.com> Reviewed-by: Ian Barwick <barwick@gmail.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/AF4FE756-A220-4DA7-87B7-A126F3F307FD@gmail.com Backpatch-through: 19