fix two typos in markup

Doc/whatsnew/whatsnew24.tex

@@ -869,7 +869,7 @@ euc-jisx0213, iso-2022-jp, iso-2022-jp-1, iso-2022-jp-2,
  \item Korean: cp949, euc-kr, johab, iso-2022-kr
 \end{itemize} 
 
-item Some other new encodings were added: ISO_8859-11, ISO_8859-16, PCTP-154, 
+\item Some other new encodings were added: ISO_8859-11, ISO_8859-16, PCTP-154, 
 and TIS-620.
 
 \item There is a new \module{collections} module for 
@@ -1045,7 +1045,7 @@ data extractors when used with \function{map()} or
 \item The \module{optparse} module was updated.  The module now passes
 its messages through \function{gettext.gettext()}, making it possible
 to internationalize Optik's help and error messages.  Help messages
-for options can now include the string \code{'%default'}, which will
+for options can now include the string \code{'\%default'}, which will
 be replaced by the option's default value.
 
 \item A new \function{getsid()} function was added to the