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Thank you for the PR @ngocnhan-tran1996

The Spring Security team prefers using the xref macro (e.g. xref:./page.adoc#id[Text]) to the shorthand xref notation (e.g. <<id>>) because the shorthand xref has limitations (e.g. it does not work with the assembler extension).

Is there a reason for changing to the shorthand xref notation in mfa.adoc? Unless there is a good reason (that the team approves of), I think that the shorthand xref changes should be removed.