[c.mb.wcs] The parameter is called 's', not 'buf'

Author: jensmaurer

source/strings.tex

@@ -6572,8 +6572,8 @@
 
 \pnum
 \remarks
-Calls to \tcode{c8rtomb} with a null pointer argument for \tcode{buf}
+Calls to \tcode{c8rtomb} with a null pointer argument for \tcode{s}
 may introduce a data race\iref{res.on.data.races}
 with other calls to \tcode{c8rtomb}
-with a null pointer argument for \tcode{buf}.
+with a null pointer argument for \tcode{s}.
 \end{itemdescr}