[tab:iostreams.summary] Add missing header in summary table (#6079)

Also reorder the headers into order of appearance,
which is how the "C library files" headers are ordered.

Author: alexriegler

source/iostreams.tex

@@ -27,7 +27,7 @@
 \ref{iostreams.base}          & Iostreams base classes      & \tcode{<ios>}        \\ \rowsep
 \ref{stream.buffers}          & Stream buffers              & \tcode{<streambuf>}  \\ \rowsep
 \ref{iostream.format}         & Formatting and manipulators &
-  \tcode{<iomanip>}, \tcode{<istream>}, \tcode{<ostream>}   \\ \rowsep
+  \tcode{<istream>}, \tcode{<ostream>}, \tcode{<iomanip>}, \tcode{<print>}   \\ \rowsep
 \ref{string.streams}          & String streams              & \tcode{<sstream>}    \\ \rowsep
 \ref{span.streams}            & Span-based streams          & \tcode{<spanstream>} \\ \rowsep
 \ref{file.streams}            & File streams                & \tcode{<fstream>}    \\ \rowsep