[valarray.syn] Footnote should reference Annex B.

Author: cpplearner

source/numerics.tex

@@ -6544,7 +6544,7 @@
 are also applicable to this type.
 This return type shall not add
 more than two levels of template nesting over the most deeply nested
-argument type.\footnote{Clause~\ref{limits} recommends a minimum number
+argument type.\footnote{Annex~\ref{implimits} recommends a minimum number
 of recursively nested template
 instantiations.
 This requirement thus indirectly suggests a minimum