[time.zone.leap.members] update note about leap seconds

Author: jwakely

source/time.tex

@@ -10192,7 +10192,7 @@
 \tcode{+1s} to indicate a positive leap second or
 \tcode{-1s} to indicate a negative leap second.
 \begin{note}
-All leap seconds inserted up through 2019 were positive leap seconds.
+All leap seconds inserted up through 2022 were positive leap seconds.
 \end{note}
 \end{itemdescr}