[string.io] Replace "turned on" with "set" for consistency.

burblebee · tkoeppe · commit 08413d7b434a · 2022-12-15T18:16:05.000Z
diff --git a/source/strings.tex b/source/strings.tex
@@ -5038,7 +5038,7 @@
 
 \pnum
 If the function extracts no characters,
-\tcode{ios_base::failbit} is turned on in the input function's local error state
+\tcode{ios_base::failbit} is set in the input function's local error state
 before \tcode{setstate} is called.
 
 \pnum
