[tab:container.assoc.req] Add missing 'Effects'

Author: jensmaurer

source/containers.tex

@@ -1827,7 +1827,8 @@
 \indexordmem{emplace_hint}%
 \tcode{a.emplace_\-hint(\brk{}p, args)}  &
  \tcode{iterator}    &
- equivalent to \tcode{a.emplace(} \tcode{std::forward<\brk{}Args\brk{}>(\brk{}args)...)}.
+ \effects
+ Equivalent to \tcode{a.emplace(} \tcode{std::forward<\brk{}Args\brk{}>(\brk{}args)...)}.
  Return value is an iterator pointing to the element with the key equivalent
  to the newly inserted element.
  The element is inserted as close as possible to the position just prior