Amazon Polly Update: Add language code for Finnish (fi-FI)

Author: AWS

.changes/next-release/feature-AmazonPolly-1daaebf.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon Polly",
+    "contributor": "",
+    "description": "Add language code for Finnish (fi-FI)"
+}

services/polly/src/main/resources/codegen-resources/endpoint-rule-set.json

@@ -3,7 +3,7 @@
     "parameters": {
         "Region": {
             "builtIn": "AWS::Region",
-            "required": false,
+            "required": true,
             "documentation": "The AWS region used to dispatch the request.",
             "type": "String"
         },

services/polly/src/main/resources/codegen-resources/service-2.json

@@ -420,7 +420,8 @@
         "ca-ES",
         "de-AT",
         "yue-CN",
-        "ar-AE"
+        "ar-AE",
+        "fi-FI"
       ]
     },
     "LanguageCodeList":{