doc: agenda: add note about plugin names
doc: agenda: add note about plugin names

Add a note explaining how plugin names are treated, and which names are
considered to be identical.

lisatn/workload-automation,ARM-software/workload-automation,lisatn/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,lisatn/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,lisatn/workload-automation,setrofim/workload-automation