[xrefdelta] Use \deprxref (#1961)

Author: jensmaurer

source/xrefdelta.tex

@@ -55,9 +55,6 @@
 % Avoid duplication with synopsis.
 \movedxref{re.regex.const}{re.regex}
 
-% Deprecated free-function atomic access to shared pointers
-\movedxref{util.smartptr.shared.atomic}{depr.util.smartptr.shared.atomic}
-
 % Single-item [insert.iterators] subclauses were dissolved.
 \movedxref{back.insert.iter.cons}{back.insert.iter.ops}
 \movedxref{back.insert.iter.op=}{back.insert.iter.ops}
@@ -81,3 +78,6 @@
 
 % Deprecated features.
 %\deprxref{old.label}  (if moved to depr.old.label, otherwise use \movedxref)
+
+% Deprecated free-function atomic access to shared pointers
+\deprxref{util.smartptr.shared.atomic}