Update New-CsOnlineSession.md

Removed UserName. Made Credential as default.

Author: pupara

skype/skype-ps/skype/New-CsOnlineSession.md

@@ -16,14 +16,7 @@ Creates a persistent connection to Microsoft Skype for Business Online DataCente
 
 ## SYNTAX
 
-### UserName (Default)
-```
-New-CsOnlineSession [[-UserName] <String>] [-OverrideAdminDomain <String>] [-OverrideDiscoveryUri <Uri>]
- [-OverridePowerShellUri <Uri>] [-OverrideAccessTokenResourceUri <Uri>] [-SessionOption <PSSessionOption>]
- [<CommonParameters>]
-```
-
-### Credential
+### Credential (Default)
 ```
 New-CsOnlineSession [[-Credential] <PSCredential>] [-OverrideAdminDomain <String>]
  [-OverrideDiscoveryUri <Uri>] [-OverridePowerShellUri <Uri>] [-OverrideAccessTokenResourceUri <Uri>]
@@ -45,14 +38,16 @@ In this session, Skype for Business Online administrator can run Skype for Busin
 
 ### EXAMPLE 1
 ```
-New-CsOnlineSession -UserName [email protected]
+$credential = get-credential
+New-CsOnlineSession -Credential $credential
 ```
 
 Establishes a Skype for Business Online Remote PowerShell session, supplying the credentials of a Skype for Business Online administrator account.
 
 ### EXAMPLE 2
 ```
-New-CsOnlineSession -UserName [email protected] -OverrideAdminDomain fabrikam.onmicrosoft.com
+$credential = get-credential
+New-CsOnlineSession -Credential $credential -OverrideAdminDomain fabrikam.onmicrosoft.com
 ```
 
 Establishes a Skype for Business Online Remote PowerShell session, with a Skype for Business Online administrator account that has permission to manage the tenant fabrikam.onmicrosoft.com that was specified using the optional OverrideAdminDomain parameter.
@@ -67,21 +62,6 @@ Establishes a Skype for Business Online Remote PowerShell session using multi-fa
 
 ## PARAMETERS
 
-### -UserName
-Specifies the Skype for Business Online administrator account name to be used when prompting for credentials.
-
-```yaml
-Type: String
-Parameter Sets: UserName
-Aliases:
-
-Required: False
-Position: 1
-Default value: None
-Accept pipeline input: False
-Accept wildcard characters: False
-```
-
 ### -Credential
 Specifies a Skype for Business Online administrator, or Syndicated Partner administrator account.