Update changelog item with queue size recommendation

.chloggen/feat_loadbalancing-exporter-queue.yaml

@@ -15,7 +15,9 @@ issues: [35378,16826]
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-subtext: OTLP sub-exporter queue will be automatically disabled if loadbalancing exporter queue is enabled to avoid data loss
+subtext: |
+  When switching to top-level sending_queue configuration - users should carefully review queue size
+  In some rare cases setting top-level queue size to n*queueSize might be not enough to prevent data loss
 
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