Update Set-ExchangeFeature.md

Confirm, WhatIf, and clarification on switch parameters.

Author: chrisda

exchange/exchange-ps/exchange/Set-ExchangeFeature.md

@@ -24,7 +24,9 @@ For information about the parameter sets in the Syntax section below, see [Excha
 Set-ExchangeFeature [-Identity] <ServerIdParameter>
  [-Approve]
  [-Block]
+ [-Confirm]
  [-FeatureID <MultiValuedProperty>]
+ [-WhatIf]
  [<CommonParameters>]
 ```
 
@@ -80,7 +82,7 @@ Accept wildcard characters: False
 ```
 
 ### -Approve
-The Approve parameter approves the feature specified by the FeatureID parameter.
+The Approve switch approves the feature specified by the FeatureID parameter. You don't need to specify a value with this switch.
 
 ```yaml
 Type: SwitchParameter
@@ -96,7 +98,7 @@ Accept wildcard characters: False
 ```
 
 ### -Block
-he Block parameter blocks the feature specified by the FeatureID parameter.
+The Block switch blocks the feature specified by the FeatureID parameter. You don't need to specify a value with this switch.
 
 ```yaml
 Type: SwitchParameter
@@ -111,6 +113,25 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -Confirm
+The Confirm switch specifies whether to show or hide the confirmation prompt. How this switch affects the cmdlet depends on if the cmdlet requires confirmation before proceeding.
+
+- Destructive cmdlets (for example, Remove-\* cmdlets) have a built-in pause that forces you to acknowledge the command before proceeding. For these cmdlets, you can skip the confirmation prompt by using this exact syntax: `-Confirm:$false`.
+- Most other cmdlets (for example, New-\* and Set-\* cmdlets) don't have a built-in pause. For these cmdlets, specifying the Confirm switch without a value introduces a pause that forces you acknowledge the command before proceeding.
+
+```yaml
+Type: SwitchParameter
+Parameter Sets: (All)
+Aliases: cf
+Applicable: Exchange Server 2019
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### -FeatureID
 The FeatureID parameter specifies the feature you want to control.
 
@@ -127,6 +148,22 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -WhatIf
+The WhatIf switch simulates the actions of the command. You can use this switch to view the changes that would occur without actually applying those changes. You don't need to specify a value with this switch.
+
+```yaml
+Type: SwitchParameter
+Parameter Sets: (All)
+Aliases: wi
+Applicable: Exchange Server 2019
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### CommonParameters
 This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](https://go.microsoft.com/fwlink/p/?LinkID=113216).