Update comment to more accurately reflect sharded cluster behavior #1064
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SERVER-79306 clarified this is expected behavior. This PR updates the relevant comment accordingly to avoid misleading implications + to be consistency with the existing comment in aggregation_examples.cpp.
The equivalent unified spec test likely does not encounter this issue due to reuse of the
client0object used to create collections indatabase0during thecreateEntitiesstage, which adds entries to the logical session cache that are visible by the time the aggregate command is executed.