Update endpoint ruleset parameters casing

Author: aws-sdk-dotnet-automation

generator/ServiceModels/security-ir/security-ir-2018-05-10.endpoint-rule-set.json

@@ -6,19 +6,19 @@
             "required": true,
             "default": false,
             "documentation": "When true, send this request to the FIPS-compliant regional endpoint. If the configured endpoint does not have a FIPS compliant endpoint, dispatching the request will return an error.",
-            "type": "Boolean"
+            "type": "boolean"
         },
         "Endpoint": {
             "builtIn": "SDK::Endpoint",
             "required": false,
             "documentation": "Override the endpoint used to send this request",
-            "type": "String"
+            "type": "string"
         },
         "Region": {
             "builtIn": "AWS::Region",
             "required": false,
             "documentation": "The AWS region used to dispatch the request.",
-            "type": "String"
+            "type": "string"
         }
     },
     "rules": [