Update comments to match location of definition

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: aca17fe206a9b8b73ec76f10a3256f1bf019e1a6
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2023-09-06T08:18:30Z
Releases: 17.0
Update comments to match location of definition

Commit cc50080a82 rearranged testsuites to reduce dependencies, but
missed to update a comment when moving an operator class definition.
Also fix a typo in that same comment while here.

Author: Suraj Kharage <suraj.kharage@enterprisedb.com>
Discussion: https://postgr.es/m/CAF1DzPWXd2yq9_=P905cEypMVKw3ho+Fpj4HwJ4ta8T-eh+Yig@mail.gmail.com

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