[sequence.reqmts] Remove unnecessary qualification of which new element

There is only one new element, and this avoids having to decide whether it should say args....

Author: jwakely

source/containers.tex

@@ -1478,8 +1478,7 @@
 
 \pnum
 \returns
-An iterator that points to
-the new element constructed from \tcode{args} into \tcode{a}.
+An iterator that points to the new element.
 \end{itemdescr}
 
 \indexcont{insert}%