updated links to redirect to v4 ref url for v4 user guide

Author: sankettangade

generator/AWSPSGeneratorLib/HelpMaterials/WebHelp/StaticContent/items/pstoolsref-welcome.html

@@ -134,7 +134,7 @@ <h2 class="title" style="clear: both" id="d0e153">
                         <dl>
                             <dt>
                                 <span class="term">
-                                    <a class="link" href="https://docs.aws.amazon.com/powershell/latest/userguide/pstools-getting-set-up.html" target="_parent" title="Setting up the AWS Tools for Windows PowerShell">
+                                    <a class="link" href="https://docs.aws.amazon.com/powershell/v4/userguide/pstools-getting-set-up.html" target="_parent" title="Setting up the AWS Tools for Windows PowerShell">
                                         Setting up the AWS Tools for PowerShell
                                     </a>
                                 </span>
@@ -149,7 +149,7 @@ <h2 class="title" style="clear: both" id="d0e153">
                             </dd>
                             <dt>
                                 <span class="term">
-                                    <a class="link" href="https://docs.aws.amazon.com/powershell/latest/userguide/pstools-getting-started.html" target="_parent" title="Getting Started with the AWS Tools for PowerShell">
+                                    <a class="link" href="https://docs.aws.amazon.com/powershell/v4/userguide/pstools-getting-started.html" target="_parent" title="Getting Started with the AWS Tools for PowerShell">
                                         Getting Started with the AWS Tools for PowerShell
                                     </a>
                                 </span>
@@ -163,7 +163,7 @@ <h2 class="title" style="clear: both" id="d0e153">
                             </dd>
                             <dt>
                                 <span class="term">
-                                    <a class="link" href="https://docs.aws.amazon.com/powershell/latest/userguide/pstools-using.html" target="_parent" title="Using the AWS Tools for PowerShell">
+                                    <a class="link" href="https://docs.aws.amazon.com/powershell/v4/userguide/pstools-using.html" target="_parent" title="Using the AWS Tools for PowerShell">
                                         Using the AWS Tools for PowerShell
                                     </a>
                                 </span>