C comment: mention no doc for negative start of substring(text)

Bruce Momjian <bruce@momjian.us>

Commit: e648e77e25708874196326b6e4da30e7717156ab
Author: Bruce Momjian <bruce@momjian.us>
Date: 2024-03-26T16:27:41Z
Releases: 17.0
C comment:  mention no doc for negative start of substring(text)

Also add URL to hackers discussion.

Backpatch-through: master

Files

PathChange+/−
src/backend/utils/adt/varlena.c modified +3 −2