Fix typography of Martin's name

Doc/whatsnew/whatsnew20.tex

@@ -1214,8 +1214,8 @@ the function to be called on exit.
 \item{\module{gettext}:} This module provides internationalization
 (I18N) and localization (L10N) support for Python programs by
 providing an interface to the GNU gettext message catalog library.
-(Integrated by Barry Warsaw, from separate contributions by Martin von
-Loewis, Peter Funk, and James Henstridge.)
+(Integrated by Barry Warsaw, from separate contributions by Martin 
+von~L\"owis, Peter Funk, and James Henstridge.)
 
 \item{\module{linuxaudiodev}:} Support for the \file{/dev/audio}
 device on Linux, a twin to the existing \module{sunaudiodev} module.

Doc/whatsnew/whatsnew24.tex

@@ -1336,7 +1336,7 @@ be used to implement other rotating handlers.
 \item The \module{marshal} module now shares interned strings on unpacking a 
 data structure.  This may shrink the size of certain pickle strings,
 but the primary effect is to make \file{.pyc} files significantly smaller.
-(Contributed by Martin von Loewis.)
+(Contributed by Martin von~L\"owis.)
 
 \item The \module{nntplib} module's \class{NNTP} class gained
 \method{description()} and \method{descriptions()} methods to retrieve 
@@ -1688,7 +1688,7 @@ Some of the changes to Python's build process and to the C API are:
 \begin{itemize}
 
 \item The Windows port now builds under MSVC++ 7.1 as well as version 6.
-  (Contributed by Martin von Loewis.)
+  (Contributed by Martin von~L\"owis.)
 
 \end{itemize}