rpk: add TODO on hardcoded config section

These workarounds should be removed in a future version of
`redpanda`, now that bug fixes are in place in the core.
They are left here for now to ensure backwards compatibility
between an upgraded version of `rpk` and an un-upgraded `redpanda`
cluster.

src/go/rpk/pkg/cli/topic/config.go

@@ -76,6 +76,8 @@ valid, but does not apply it.
 			// at the same time, so we issue first the set request for write,
 			// then the rest of the requests.
 			// See https://github.com/redpanda-data/redpanda/issues/9191
+			// TODO: Remove this in the next major version.
+			// See https://github.com/redpanda-data/redpanda/pull/23545.
 			_, isRRR := setKVs["redpanda.remote.read"]
 			wv, isRRW := setKVs["redpanda.remote.write"]
 			rrwErrors := make(map[string]int16)