Update Set-MailboxRegionalConfiguration.md

Issue #11435

Author: chrisda

exchange/exchange-ps/exchange/Set-MailboxRegionalConfiguration.md

@@ -75,7 +75,7 @@ This example sets Marcelo Teixeira's mailbox language to Brazilian Portuguese, a
 
 ### Example 2
 ```powershell
-Set-MailboxRegionalConfiguration -Identity "Ella Lack's" -DateFormat "d/m/yyyy"
+Set-MailboxRegionalConfiguration -Identity "Ella Lack's" -DateFormat "d/M/yyyy"
 ```
 
 This example sets the date format for Ella Lack's mailbox.