fix link for overview.md.

Author: kenwith

sharepoint/docs-conceptual/overview.md

@@ -30,7 +30,7 @@ Before you can use the Add-SPShellAdmin cmdlet to grant permissions for users to
 
 **NOTE:** If these permissions are not satisfied, contact your Setup administrator or SQL Server administrator to request these permissions.
 
-For additional information about PowerShell permissions, see [Add-SPShellAdmin](../../sharepoint-ps/sharepoint-server/Add-SPShellAdmin.md).
+For additional information about PowerShell permissions, see [Add-SPShellAdmin](../sharepoint-ps/sharepoint-server/Add-SPShellAdmin.md).
 
 If you do not have membership in the **SharePoint_Shell_Access** role or **WSS_Admin_WPG** local group, use the **Add-SPShellAdmin** cmdlet to add the **WSS_Admin_WPG** group in all front-end web servers in the SharePoint farm and the **SharePoint_Shell_Access** role. If the SQL Server database does not have a **SharePoint_Shell_Access** role, the role is automatically created when you run the **Add-SPShellAdmin** cmdlet. After you run the **Add-SPShellAdmin** cmdlet, users can run SharePoint PowerShell cmdlets in a multiple-server farm environment.