update comments in example

Author: labkey-klum

samples/experiment_platemetadata_example.py

@@ -46,7 +46,11 @@
     'VisitId' : 333,
     'WellLocation' : 'F12'
 }]
+
+# Assays that are configured for plate support have a required run property for the plate template, this is the plate template lsid
 runTest.properties['PlateTemplate'] = 'urn:lsid:labkey.com:PlateTemplate.Folder-6:d8bbec7d-34cd-1038-bd67-b3bd777822f8'
+
+# The assay plate metadata is a specially formatted JSON object to map properties to the well groups
 runTest.plate_metadata = {
     'control' : {
       'positive' : {'dilution':  0.005},