[span.cons] Add std:: for data(arr) (#6632)

Author: cpplearner

source/containers.tex

@@ -18450,7 +18450,7 @@
 \begin{itemdescr}
 \pnum
 \constraints
-Let \tcode{U} be \tcode{remove_pointer_t<decltype(data(arr))>}.
+Let \tcode{U} be \tcode{remove_pointer_t<decltype(std::data(arr))>}.
 \begin{itemize}
 \item \tcode{extent == dynamic_extent || N == extent} is \tcode{true}, and
 \item \tcode{is_convertible_v<U(*)[], element_type(*)[]>} is \tcode{true}.
@@ -18469,7 +18469,7 @@
 
 \pnum
 \ensures
-\tcode{size() == N \&\& data() == data(arr)} is \tcode{true}.
+\tcode{size() == N \&\& data() == std::data(arr)} is \tcode{true}.
 \end{itemdescr}
 
 \indexlibraryctor{span}%