Added description for -ReplyTo parameter (#4035)

Author: Andrew

reference/6/Microsoft.PowerShell.Utility/Send-MailMessage.md

@@ -18,7 +18,7 @@ Sends an email message.
 ```
 Send-MailMessage [-To] <string[]> [-Subject] <string> [[-Body] <string>] [[-SmtpServer] <string>]
 -From <string> [-Attachments <string[]>] [-Bcc <string[]>] [-BodyAsHtml] [-Encoding <Encoding>]
-[-Cc <string[]>] [-DeliveryNotificationOption <DeliveryNotificationOptions>]
+[-Cc <string[]>] [-ReplyTo <string[]>] [-DeliveryNotificationOption <DeliveryNotificationOptions>]
 [-Priority <MailPriority>] [-Credential <pscredential>] [-UseSsl] [-Port <int>] [<CommonParameters>]
 ```
 
@@ -170,6 +170,23 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -ReplyTo
+
+Specifies additional email addresses (other than the From address) to use to reply to this message.
+Enter names (optional) and the email address, such as `Name <someone@fabrikam.com>`.
+
+```yaml
+Type: String[]
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### -Credential
 
 Specifies a user account that has permission to perform this action. The default is the current