[diagnostics] Turn synopses into numbered sections

Author: tkoeppe

source/diagnostics.tex

@@ -48,8 +48,7 @@
 defines several types of predefined exceptions for reporting errors in a \Cpp program.
 These exceptions are related by inheritance.
 
-\synopsis{Header \tcode{<stdexcept>} synopsis}
-
+\rSec2[stdexcept.syn]{Header \tcode{<stdexcept>} synopsis}
 \indexlibrary{\idxhdr{stdexcept}}%
 \indexlibrary{\idxcode{logic_error}}%
 \indexlibrary{\idxcode{domain_error}}%
@@ -60,6 +59,7 @@
 \indexlibrary{\idxcode{range_error}}%
 \indexlibrary{\idxcode{overflow_error}}%
 \indexlibrary{\idxcode{underflow_error}}%
+
 \begin{codeblock}
 namespace std {
   class logic_error;
@@ -681,8 +681,7 @@
 Implementations should leave the error states provided by other
 libraries unchanged.
 
-\synopsis{Header \tcode{<system_error>} synopsis}
-
+\rSec2[system_error.syn]{Header \tcode{<system_error>} synopsis}
 \indexlibrary{\idxcode{error_category}}%
 \indexlibrary{\idxcode{error_code}}%
 \indexlibrary{\idxcode{error_condition}}%
@@ -692,6 +691,7 @@
 \indexlibrary{\idxcode{errc}}%
 \indexlibrary{\idxcode{make_error_code}}%
 \indexlibrary{\idxcode{make_error_condition}}%
+
 \begin{codeblock}
 namespace std {
   class error_category;