docs: Consistently use <optional> to indicate optional parameters

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 0d829703363ba70844ff545ccc73befb2a7fed2e
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-11-04T16:28:40Z
Releases: 18.0
docs: Consistently use <optional> to indicate optional parameters

Some functions were using square brackets instead, replace them all
with <optional>.

Author: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CACJufxFfUbSph5UUSsZbL4SitbuPuW%3DEccpKgEaZrjtrPPuadQ@mail.gmail.com

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