[output.iterators] Strike useless sentence from note (#2083)

There's no such thing as an "insert pointer," and the rest of this sentence isn't much better.

Author: CaseyCarter

source/iterators.tex

@@ -480,10 +480,6 @@
 \term{single pass}
 algorithms.
 Equality and inequality might not be defined.
-Algorithms that take output iterators can be used with ostreams as the destination
-for placing data through the
-\tcode{ostream_iterator}
-class as well as with insert iterators and insert pointers.
 \end{note}
 
 \rSec2[forward.iterators]{Forward iterators}