[Doc]: Required parameters for IBM Cloud Data Engine

[ilovechai]

These properties need to be set in order for the IBM Cloud Data Engine connection to persist in Watson Knowledge Catalog:

Ex:

networkAddress: jdbc:ibmcloudsql:crn:v1:bluemix:public:sql-query:us-south:a/asdasdasdasdasd:asdfe3-asdd-asdd-asdd-asdasddddqq::?targetcosurl=cos://us-south/sql-asdasdd-qwee-qwee-qwee-qweqweqweqw/result/
crn: crn:v1:bluemix:public:sql-query:us-south:a/asdasdasdasdasd:asdfe3-asdd-asdd-asdd-asdasddddqq::
password: password
targetCloudObjectStorage: cos://us-south/sql-asdasdd-qwee-qwee-qwee-qweqweqweqw/result/

These secured properties need to be added to the documentation here https://egeria-project.org/connectors/repository/hms/overview/?h=hive#using-with-the-ibm-cloud-data-engine-service.