Change hyphens to camelCase for message keys in error handling doc
Change hyphens to camelCase for message keys in error handling doc

Updated the example in the doc to match our message key naming conventions
OpenLMIS/openlmis-template-service,OpenLMIS/openlmis-template-service,OpenLMIS/openlmis-template-service,OpenLMIS/openlmis-template-service