Improve Azure Service Bus Connector documentation

[chanikag]

Description

This task is to improve Azure Service Bus Connector documentation
For example, the blog [1] has the information we needed instruction like follow is really matters

e.g
4. Obtain the Primary Shared Access Policies. (Note: If there are any ‘+’ marks in the shared key, use the URL encoded value. You can use ‘%2b’ for the ‘+’ mark.)

[1] https://medium.com/@cvr4314/azure-service-bus-queue-integration-with-wso2-ei-mi-azure-service-bus-producer-f25b21e16a59

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[chanikag]

https://github.com/wso2-enterprise/wso2-mi-internal/issues/2