Amazon Neptune Update: Doc-only update to address customer use.

Author: AWS

.changes/next-release/feature-AmazonNeptune-f370946.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon Neptune",
+    "contributor": "",
+    "description": "Doc-only update to address customer use."
+}

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

@@ -1542,7 +1542,7 @@
       "members":{
         "SourceDBClusterSnapshotIdentifier":{
           "shape":"String",
-          "documentation":"<p>The identifier of the DB cluster snapshot to copy. This parameter is not case-sensitive.</p> <p>Constraints:</p> <ul> <li> <p>Must specify a valid system snapshot in the \"available\" state.</p> </li> <li> <p>Specify a valid DB snapshot identifier.</p> </li> </ul> <p>Example: <code>my-cluster-snapshot1</code> </p>"
+          "documentation":"<p>The identifier of the DB cluster snapshot to copy. This parameter is not case-sensitive. If the source DB cluster snapshot is in a different region or owned by another account, specify the snapshot ARN.</p> <p>Constraints:</p> <ul> <li> <p>Must specify a valid system snapshot in the \"available\" state.</p> </li> <li> <p>Specify a valid DB snapshot identifier.</p> </li> </ul> <p>Example: <code>my-cluster-snapshot1</code> </p>"
         },
         "TargetDBClusterSnapshotIdentifier":{
           "shape":"String",