doc: fix for commit 09f7d36ba16 in changing "_" to "-".

Bruce Momjian <bruce@momjian.us>

Commit: d0d1bcb1e8b2e324bc243d69ccfce55b25a79f8c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-06-18T20:48:26Z
Releases: 18.0
doc:  fix for commit 09f7d36ba16 in changing "_" to "-".

I thought underscores wouldn't even work in "id"s, so I never checked to
see if anything referenced it, but it seems it does work, so adjust the
calling site for the dash syntax.

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