[tab:meta.unary.prop] Fix punctuation (cplusplus#8197)

Author: Andreas-Krug

source/meta.tex

@@ -1521,7 +1521,7 @@
  \tcode{remove_all_extents_t<T>> \&\& is_nothrow_destructible_v<}
  \tcode{remove_all_extents_t<T>>)} &
  \tcode{remove_all_extents_t<T>} shall be a complete type or
- \cv{}~\keyword{void}, \\ \rowsep
+ \cv{}~\keyword{void}. \\ \rowsep
 
 \indexlibraryglobal{is_implicit_lifetime}%
 \tcode{template<class T>}\br