AWS CloudTrail Update: Doc-only update for CloudTrail.

Author: AWS

.changes/next-release/feature-AWSCloudTrail-5f0ed80.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS CloudTrail",
+    "contributor": "",
+    "description": "Doc-only update for CloudTrail."
+}

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

@@ -1791,7 +1791,7 @@
         },
         "SnsTopicName":{
           "shape":"String",
-          "documentation":"<p>Specifies the name of the Amazon SNS topic defined for notification of log file delivery. The maximum length is 256 characters.</p>"
+          "documentation":"<p>Specifies the name or ARN of the Amazon SNS topic defined for notification of log file delivery. The maximum length is 256 characters.</p>"
         },
         "IncludeGlobalServiceEvents":{
           "shape":"Boolean",
@@ -5432,7 +5432,7 @@
         },
         "SnsTopicName":{
           "shape":"String",
-          "documentation":"<p>Specifies the name of the Amazon SNS topic defined for notification of log file delivery. The maximum length is 256 characters.</p>"
+          "documentation":"<p>Specifies the name or ARN of the Amazon SNS topic defined for notification of log file delivery. The maximum length is 256 characters.</p>"
         },
         "IncludeGlobalServiceEvents":{
           "shape":"Boolean",