[error.reporting] Change \rSec3 to \rSec2 (#1954)

jwakely · tkoeppe · commit dcf7f0514bf0 · 2018-03-30T16:01:50.000+01:00
Fixes #1953
diff --git a/source/iostreams.tex b/source/iostreams.tex
@@ -2763,7 +2763,7 @@
 \returns \tcode{str}.
 \end{itemdescr}
 
-\rSec3[error.reporting]{Error reporting}
+\rSec2[error.reporting]{Error reporting}
 
 \indexlibrarymember{make_error_code}{io_errc}%
 \begin{itemdecl}
