[time.cal.wdidx.nonmembers] Remove extra "

Author: cpplearner

source/time.tex

@@ -5276,7 +5276,7 @@
 auto i = wdi.index();
 return os << (i >= 1 && i <= 5 ?
   format(os.getloc(), @\placeholder{STATICALLY-WIDEN}@<charT>("{}[{}]"), wdi.weekday(), i) :
-  format(os.getloc(), @\placeholder{STATICALLY-WIDEN}@<charT>("{}[{} is not a valid index"]"),
+  format(os.getloc(), @\placeholder{STATICALLY-WIDEN}@<charT>("{}[{} is not a valid index]"),
          wdi.weekday(), i));
 \end{codeblock}
 \end{itemdescr}