replace invalid unicode code point in securityinsights (#18068)

Author: cataggar

specification/securityinsights/resource-manager/Microsoft.SecurityInsights/stable/2021-10-01/common/EntityTypes.json

@@ -62,7 +62,7 @@
           "type": "boolean"
         },
         "ntDomain": {
-          "description": "The NetBIOS domain name as it appears in the alert format – domain\\username. Examples: NT AUTHORITY.",
+          "description": "The NetBIOS domain name as it appears in the alert format - domain\\username. Examples: NT AUTHORITY.",
           "readOnly": true,
           "type": "string"
         },