[global.functions] Clarify note by adding a cross-reference to make it

clearer that we're quoting another part of the standard. Update the
quotation to match, and clean it up slightly.

Author: zygoloid

source/iterators.tex

@@ -2958,9 +2958,9 @@
 \effects
 \begin{codeblock}
 *@\textit{out_stream}@ << value;
-if(delim != 0)
+if (@\textit{delim}@ != 0)
   *@\textit{out_stream}@ << @\textit{delim}@;
-return (*this);
+return *this;
 \end{codeblock}
 \end{itemdescr}
 

source/lib-intro.tex

@@ -2511,13 +2511,14 @@
 The phrase ``unless otherwise specified'' is intended to allow
 argument-dependent lookup
 in cases like that of
-\tcode{ostream_iterator}s:
+\tcode{ostream_iterator::operator=}~(\ref{ostream.iterator.ops}):
+
 \effects
 \begin{codeblock}
-*out_stream << value;
-if (delim != 0)
-  *out_stream << delim;
-return (*this);
+*@\textit{out_stream}@ << value;
+if (@\textit{delim}@ != 0)
+  *@\textit{out_stream}@ << @\textit{delim}@;
+return *this;
 \end{codeblock}
 \exitnote