Drop obsolete reference to checkpoint_segments

In b7fda4a a note was dropped, but not
entirely.

Fixes: b7fda4a ("Add feedback from Github")

guides/common/modules/con_postgresql-tuning.adoc

@@ -39,7 +39,3 @@ Setting this value to 8 MB should be more than enough for most of the intensive
 * `autovacuum_vacuum_cost_limit`: The key defines the cost limit value for the vacuuming operation inside the autovacuum process to clean up the dead tuples inside the database relations.
 The cost limit defines the number of tuples that can be processed in a single run by the process.
 {Team} recommends setting the value to `2000` as it is for the _medium_, _large_, _extra-large_, and _extra-extra-large_ profiles, based on the general load that {Project} pushes on the PostgreSQL server process.
-
-ifndef::orcharhino[]
-For more information, see https://bugzilla.redhat.com/show_bug.cgi?id=1867311#c12[BZ1867311: Upgrade fails when checkpoint_segments postgres parameter configured].
-endif::[]