Change quantity for groups of wrapper types from * to + in ecephys

Author: ehennestad

core/nwb.ecephys.yaml

@@ -196,7 +196,7 @@ groups:
   groups:
   - neurodata_type_inc: SpikeEventSeries
     doc: SpikeEventSeries object(s) containing detected spike event waveforms.
-    quantity: '*'
+    quantity: '+'
 
 - neurodata_type_def: FilteredEphys
   neurodata_type_inc: NWBDataInterface