[istreambuf.iterator] Join subsections for operations descriptions.

There was one subsection for every operator, yet everything
fits on half a page.

Fixes #1429.

Author: jensmaurer

source/iterators.tex

@@ -3028,7 +3028,7 @@
 }
 \end{codeblock}
 
-\rSec3[istreambuf.iterator::proxy]{Class template \tcode{istreambuf_iterator::proxy}}
+\rSec3[istreambuf.iterator.proxy]{Class template \tcode{istreambuf_iterator::proxy}}
 
 \indexlibrary{\idxcode{proxy}!\idxcode{istreambuf_iterator}}%
 \begin{codeblock}
@@ -3114,7 +3114,7 @@
 Initializes \tcode{sbuf_} with \tcode{p.sbuf_}.
 \end{itemdescr}
 
-\rSec3[istreambuf.iterator::op*]{\tcode{istreambuf_iterator::operator*}}
+\rSec3[istreambuf.iterator.ops]{\tcode{istreambuf_iterator} operations}
 
 \indexlibrarymember{operator*}{istreambuf_iterator}%
 \begin{itemdecl}
@@ -3130,8 +3130,6 @@
 \tcode{sbuf_->sgetc()}.
 \end{itemdescr}
 
-\rSec3[istreambuf.iterator::op++]{\tcode{istreambuf_iterator::operator++}}
-
 \indexlibrarymember{operator++}{istreambuf_iterator}%
 \begin{itemdecl}
 istreambuf_iterator& operator++();
@@ -3158,8 +3156,6 @@
 \tcode{proxy(sbuf_->sbumpc(), sbuf_)}.
 \end{itemdescr}
 
-\rSec3[istreambuf.iterator::equal]{\tcode{istreambuf_iterator::equal}}
-
 \indexlibrarymember{equal}{istreambuf_iterator}%
 \begin{itemdecl}
 bool equal(const istreambuf_iterator& b) const;
@@ -3175,8 +3171,6 @@
 object they use.
 \end{itemdescr}
 
-\rSec3[istreambuf.iterator::op==]{\tcode{operator==}}
-
 \indexlibrarymember{operator==}{istreambuf_iterator}%
 \begin{itemdecl}
 template <class charT, class traits>
@@ -3190,8 +3184,6 @@
 \tcode{a.equal(b)}.
 \end{itemdescr}
 
-\rSec3[istreambuf.iterator::op!=]{\tcode{operator!=}}
-
 \indexlibrarymember{operator"!=}{istreambuf_iterator}%
 \begin{itemdecl}
 template <class charT, class traits>