remove duplicate line

Removed duplicate bullet in the list of minimum requirements under the Permissions section

Author: ttplaya

sharepoint/docs-conceptual/sharepoint-server/sharepoint-server-cmdlets.md

@@ -16,7 +16,6 @@ Whether you use the SharePoint Management Shell or the PowerShell console, you c
 
 Before you can use the Add-SPShellAdmin cmdlet to grant permissions for users to run SharePoint Server cmdlets, verify that you meet all of the following minimum requirements:
 
-* You must have membership in the **securityadmin** fixed server role on the SQL Server instance.
 * You must have membership in the **securityadmin** fixed server role on the SQL Server instance.
 * You must be a member of the Administrators group on the server on which you are running the PowerShell cmdlet.