mm-sms-properties: document mm_sms_properties_set_validity_relative ()
Per #737 , I think it makes sense to document the units in time for mm_sms_properties_set_validity_relative () , and document what the default is if it is not set.
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Per #737 , I think it makes sense to document the units in time for mm_sms_properties_set_validity_relative () , and document what the default is if it is not set.