#10646 add note about file access request email update

doc/release-notes/6.3-release-notes.md

@@ -55,6 +55,11 @@ For details see https://dataverse-guide--10321.org.readthedocs.build/en/10321/in
 
 Dataverse will use the Dataset thumbnail, if one is defined, rather than the generic Dataverse logo in the Open Graph metadata header. This means the image will be seen when, for example, the dataset is referenced on Facebook.
 
+### Improved Email Notifications When Guestbook is Used for File Access Requests
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+Multiple improvements to Guestbook response emails making it easier to organize and process them. The subject line of the notification email now includes the name and user identifier of the requestor. Additionally, the body of the email now includes the user id of the requestor. Finally the guestbook responses have been sorted and spaced to improve readability.
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 ### Improved Controlled Vocabulary for Citation Block
 
 The Controlled Vocabuary Values list for the metadata field Language in the Citation block has been improved, with some missing two- and three-letter ISO 639 codes added, as well as more alternative names for some of the languages, making all these extra language identifiers importable.