[locale.time.put.members] Remove outdated footnote

Author: cpplearner

source/text.tex

@@ -4021,9 +4021,6 @@
 obtained from \tcode{str.getloc()}.
 The first character of each sequence is equal to \tcode{'\%'},
 followed by an optional modifier character \tcode{mod}
-\begin{footnote}
-Although the C programming language defines no modifiers, most vendors do.
-\end{footnote}
 and a format specifier character \tcode{spec}
 as defined for the function \tcode{strftime}.
 If no modifier character is present, \tcode{mod} is zero.