Fix incorrect option name in usage screen

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: e5393fc2e4539bfd50e62ad4959c2712cb6505ce
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2025-09-24T12:58:18Z
Releases: 18.1
Fix incorrect option name in usage screen

The usage screen incorrectly refered to the --docs option as --sgml.
Backpatch down to v17 where this script was introduced.

Author: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/20250729.135638.1148639539103758555.horikyota.ntt@gmail.com
Backpatch-through: 17

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