Fix placement of @since tag

...following up on e3f8e1260a "Corrections on
xfasatparser IDL file."

Change-Id: I9f8ca5d38cc085256fe264ad6aedb5e15a80a213
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107052
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

offapi/com/sun/star/xml/sax/XFastParser.idl

@@ -159,9 +159,9 @@ interface XFastParser: com::sun::star::uno::XInterface
     void setNamespaceHandler( [in] XFastNamespaceHandler Handler);
 
     /**
-      * @since LibreOffice 7.1
       * Simulate a DTD file.
       * Will allow to use customized entity references like ∞ .
+      * @since LibreOffice 7.1
       */
     void setCustomEntityNames( [in] sequence<string> names, [in] sequence<string> replacements);
 };