Added text to clarify case-sensitivity

Author: aws-sdk-dotnet-automation

generator/ServiceModels/workspaces/workspaces-2015-04-08.docs.json

@@ -2845,7 +2845,7 @@
         "PendingCreateStandbyWorkspacesRequest$UserName": "<p>Describes the standby WorkSpace that was created.</p> <p>Because this operation is asynchronous, the identifier returned is not immediately available for use with other operations. For example, if you call <a href=\"https://docs.aws.amazon.com/workspaces/latest/api/API_DescribeWorkspaces.html\"> DescribeWorkspaces</a> before the WorkSpace is created, the information returned can be incomplete. </p>",
         "Workspace$UserName": "<p>The user for the WorkSpace.</p>",
         "WorkspaceDirectory$CustomerUserName": "<p>The user name for the service account.</p>",
-        "WorkspaceRequest$UserName": "<p>The user name of the user for the WorkSpace. This user name must exist in the Directory Service directory for the WorkSpace.</p> <p>The reserved keyword, <code>[UNDEFINED]</code>, is used when creating user-decoupled WorkSpaces.</p>"
+        "WorkspaceRequest$UserName": "<p>The user name of the user for the WorkSpace. This user name must exist in the Directory Service directory for the WorkSpace.</p> <p>The username is not case-sensitive, but we recommend matching the case in the Directory Service directory to avoid potential incompatibilities.</p> <p>The reserved keyword, <code>[UNDEFINED]</code>, is used when creating user-decoupled WorkSpaces.</p>"
       }
     },
     "UserSetting": {

generator/ServiceModels/workspaces/workspaces-2015-04-08.normal.json

@@ -6749,7 +6749,7 @@
         },
         "UserName":{
           "shape":"UserName",
-          "documentation":"<p>The user name of the user for the WorkSpace. This user name must exist in the Directory Service directory for the WorkSpace.</p> <p>The reserved keyword, <code>[UNDEFINED]</code>, is used when creating user-decoupled WorkSpaces.</p>"
+          "documentation":"<p>The user name of the user for the WorkSpace. This user name must exist in the Directory Service directory for the WorkSpace.</p> <p>The username is not case-sensitive, but we recommend matching the case in the Directory Service directory to avoid potential incompatibilities.</p> <p>The reserved keyword, <code>[UNDEFINED]</code>, is used when creating user-decoupled WorkSpaces.</p>"
         },
         "BundleId":{
           "shape":"BundleId",

sdk/src/Services/WorkSpaces/Generated/Model/WorkspaceRequest.cs

@@ -128,6 +128,11 @@ internal bool IsSetTags()
         /// </para>
         ///  
         /// <para>
+        /// The username is not case-sensitive, but we recommend matching the case in the Directory
+        /// Service directory to avoid potential incompatibilities.
+        /// </para>
+        ///  
+        /// <para>
         /// The reserved keyword, <c>[UNDEFINED]</c>, is used when creating user-decoupled WorkSpaces.
         /// </para>
         /// </summary>