[mdspan.layout.stride.expo] Move "otherwise" from trailing to leading

We have a mild preference for the leading position.

Author: tkoeppe

source/containers.tex

@@ -19595,23 +19595,23 @@
 Let \tcode{\exposid{REQUIRED-SPAN-SIZE}(e, strides)} be:
 \begin{itemize}
 \item
-\tcode{1}, if \tcode{e.rank() == 0} is \tcode{true}, otherwise
+\tcode{1}, if \tcode{e.rank() == 0} is \tcode{true},
 \item
-\tcode{0}, if the size of the multidimensional index space \tcode{e} is 0, otherwise
+otherwise \tcode{0}, if the size of the multidimensional index space \tcode{e} is 0,
 \item
-\tcode{1} plus the sum of products of \tcode{(e.extent($r$) - 1)} and \tcode{strides[$r$]}
+otherwise \tcode{1} plus the sum of products of \tcode{(e.extent($r$) - 1)} and \tcode{strides[$r$]}
 for all $r$ in the range $[0, \tcode{e.rank()})$.
 \end{itemize}
 
 \pnum
 Let \tcode{\exposid{OFFSET}(m)} be:
 \begin{itemize}
 \item
-\tcode{m()}, if \tcode{e.rank() == 0} is \tcode{true}, otherwise
+\tcode{m()}, if \tcode{e.rank() == 0} is \tcode{true},
 \item
-\tcode{0}, if the size of the multidimensional index space \tcode{e} is 0, otherwise
+otherwise \tcode{0}, if the size of the multidimensional index space \tcode{e} is 0,
 \item
-\tcode{m(z...)} for a pack of integers \tcode{z}
+otherwise \tcode{m(z...)} for a pack of integers \tcode{z}
 that is a multidimensional index in \tcode{m.extents()} and
 each element of \tcode{z} equals 0.
 \end{itemize}