Fix system message schema URLs (#10251)

Schema URLs are http, not https

Author: rwestMSFT

docs/database-engine/service-broker/broker-system-messages.md

@@ -24,9 +24,9 @@ In addition to the application-defined message types specified in the contract,
 
 ## Error messages
 
-When a remote service ends a dialog with an error or the local broker detects an unrecoverable error in a dialog, the local broker creates an Error Message. Error messages are of message type `https://schemas.microsoft.com/SQL/ServiceBroker/Error`. Error messages are validated as well-formed XML.
+When a remote service ends a dialog with an error or the local broker detects an unrecoverable error in a dialog, the local broker creates an Error Message. Error messages are of message type `http://schemas.microsoft.com/SQL/ServiceBroker/Error`. Error messages are validated as well-formed XML.
 
-The XML document that is contained in an error message uses the namespace `https://schemas.microsoft.com/SQL/ServiceBroker`. The root element of the document has the local name **Error**, and contains an element named **Code** and an element named **Message**. The **Code** element holds an integer value. The **Message** element holds the human-readable text of the message.
+The XML document that is contained in an error message uses the namespace `http://schemas.microsoft.com/SQL/ServiceBroker`. The root element of the document has the local name **Error**, and contains an element named **Code** and an element named **Message**. The **Code** element holds an integer value. The **Message** element holds the human-readable text of the message.
 
 For example, an error message generated by a service that processes expense reports might contain the following XML (reformatted for readability):