[simd.creation] Add commas and improve semantic linebreaks (#7895)

Author: Eisenwave

source/numerics.tex

@@ -18328,18 +18328,18 @@
 \constraints
 \begin{itemize}
  \item
-   For the first overload \tcode{T} is an enabled specialization of
-   \tcode{basic_simd}.
-   If \tcode{basic_simd<\brk{}typename T::\brk{}value_type, Abi>::size() \%
-   T::size()} is not \tcode{0} then
+   For the first overload,
+   \tcode{T} is an enabled specialization of \tcode{basic_simd}.
+   If \tcode{basic_simd<\brk{}typename T::\brk{}value_type, Abi>::size() \% T::size()}
+   is not \tcode{0}, then
    \tcode{resize_t<basic_simd<\brk{}typename T::\brk{}value_type, Abi>::size()
    \% T::size(), T>} is valid and denotes a type.
 
  \item
-   For the second overload \tcode{T} is an enabled specialization of
-   \tcode{basic_simd\-_\-mask}.
-   If \tcode{basic_simd_mask<\exposid{mask-element-size}<T>, Abi>::size() \%
-   T::size()} is not \tcode{0} then
+   For the second overload,
+   \tcode{T} is an enabled specialization of \tcode{basic_simd\-_\-mask}.
+   If \tcode{basic_simd_mask<\exposid{mask-element-size}<T>, Abi>::size() \% T::size()}
+   is not \tcode{0}, then
    \tcode{resize_t<\brk{}ba\-sic\-_\-simd_mask<\brk{}\exposid{mask-element-size}<T>,
    Abi>::size() \% T::size(), T>} is valid and denotes a type.
 \end{itemize}