Merge pull request #551 from timsong-cpp/patch-1

Fix "returns returns"

Author: jwakely

source/iostreams.tex

@@ -9949,7 +9949,7 @@
 \effects
 Calls
 \tcode{rdbuf()->close()}
-and, if that function returns
+and, if that function
 returns a null pointer,
 calls
 \tcode{setstate(\brk{}failbit)}~(\ref{iostate.flags})