P0881R7 A Proposal to add stacktrace library

 - Added some articles as required by the English language.
 - Removed [stacktrace.def] subheading to avoid confusion with
   'Terms and Definitions' clause.
 - Turned a note with 'should' into 'Recommended practice'.

Author: jensmaurer

source/lib-intro.tex

@@ -982,10 +982,11 @@
 \tcode{<span>} \\
 \tcode{<sstream>} \\
 \tcode{<stack>} \\
+\tcode{<stacktrace>} \\
 \tcode{<stdexcept>} \\
 \tcode{<stop_token>} \\
-\tcode{<streambuf>} \\
 \columnbreak
+\tcode{<streambuf>} \\
 \tcode{<string>} \\
 \tcode{<string_view>} \\
 \tcode{<strstream>} \\

source/support.tex

@@ -672,6 +672,7 @@
 #define @\defnlibxname{cpp_lib_source_location}@                   201907L // also in \libheader{source_location}
 #define @\defnlibxname{cpp_lib_span}@                              202002L // also in \libheader{span}
 #define @\defnlibxname{cpp_lib_ssize}@                             201902L // also in \libheader{iterator}
+#define @\defnlibxname{cpp_lib_stacktrace}@                        202011L // also in \libheader{stacktrace}
 #define @\defnlibxname{cpp_lib_starts_ends_with}@                  201711L // also in \libheader{string}, \libheader{string_view}
 #define @\defnlibxname{cpp_lib_string_contains}@                   202011L // also in \libheader{string}, \libheader{string_view}
 #define @\defnlibxname{cpp_lib_string_udls}@                       201304L // also in \libheader{string}