[ostream.cons] clarify boolean expression

Eisenwave · Eisenwave · commit 7dc13f07c846 · 2023-08-30T13:48:12.000+02:00
diff --git a/source/iostreams.tex b/source/iostreams.tex
@@ -6097,7 +6097,7 @@
 
 \pnum
 \ensures
-\tcode{rdbuf() == sb}.
+\tcode{rdbuf() == sb} is \keyword{true}.
 \end{itemdescr}
 
 \indexlibraryctor{basic_ostream}%
