[utility], [bitset] Introduce a separate heading for the synopsis. (#1213)

Partially addresses #566.

Author: jensmaurer

source/utilities.tex

@@ -40,12 +40,7 @@
 \indextext{\idxhdr{utility}}%
 \indexlibrary{\idxhdr{utility}}%
 \indexlibrary{\idxcode{rel_ops}}%
-\synopsis{Header \tcode{<utility>} synopsis}
-
-\pnum
-The header \tcode{<utility>} defines several types and function templates
-that are described in this Clause. It also defines the template \tcode{pair}
-and various function templates that operate on \tcode{pair} objects.
+\rSec2[utility.syn]{Header \tcode{<utility>} synopsis}
 
 \begin{codeblock}
 #include <initializer_list>
@@ -250,6 +245,11 @@
 }
 \end{codeblock}
 
+\pnum
+The header \tcode{<utility>} defines several types and function templates
+that are described in this Clause. It also defines the template \tcode{pair}
+and various function templates that operate on \tcode{pair} objects.
+
 \pnum
 The type \tcode{chars_format}
 is a bitmask type~(\ref{bitmask.types})
@@ -5886,10 +5886,10 @@
 \end{example}
 \end{itemdescr}
 
-\rSec1[template.bitset]{Class template \tcode{bitset}}%
+\rSec1[bitset]{Bitsets}
 \indexlibrary{\idxcode{bitset}}%
 
-\synopsis{Header \tcode{<bitset>} synopsis}%
+\rSec2[bitset.syn]{Header \tcode{<bitset>} synopsis}%
 
 \indextext{\idxhdr{bitset}}%
 \indexlibrary{\idxhdr{bitset}}%
@@ -5924,6 +5924,7 @@
 and several related functions for representing
 and manipulating fixed-size sequences of bits.
 
+\rSec2[template.bitset]{Class template \tcode{bitset}}%
 \indexlibrary{\idxcode{bitset}}%
 \begin{codeblock}
 namespace std {
@@ -6049,7 +6050,7 @@
 \indexlibrary{\idxcode{overflow_error}}%
 \end{itemize}
 
-\rSec2[bitset.cons]{\tcode{bitset} constructors}
+\rSec3[bitset.cons]{\tcode{bitset} constructors}
 
 \indexlibrary{\idxcode{bitset}!constructor}%
 \begin{itemdecl}
@@ -6159,7 +6160,7 @@
 \end{itemdescr}
 
 
-\rSec2[bitset.members]{\tcode{bitset} members}
+\rSec3[bitset.members]{\tcode{bitset} members}
 
 \indexlibrarymember{operator\&=}{bitset}%
 \begin{itemdecl}