[ostream] Add back the comments that P1423R3 requested, but now as a

note.

Author: zygoloid

source/iostreams.tex

@@ -5927,6 +5927,12 @@
 rethrows the exception without completing its actions, otherwise
 it does not throw anything and treat as an error.
 
+\pnum
+\begin{note}
+The deleted overloads of \tcode{operator<<}
+prevent formatting characters as integers and strings as pointers.
+\end{note}
+
 \rSec4[ostream.cons]{Constructors}
 
 \indexlibrary{\idxcode{basic_ostream}!constructor}%