Typeset Ludo's name correctly

* doc/ref/history.texi (A Scheme of Many Maintainers): Add
  TeX-specific version of `Courtès'.

doc/ref/history.texi

@@ -133,9 +133,21 @@ years until the end of 1999, when he too moved on to other projects.
 Since then, Guile has had a group maintainership. The first group was
 Maciej Stachowiak, Mikael Djurfeldt, and Marius Vollmer, with Vollmer
 staying on the longest. By late 2007, Vollmer had mostly moved on to
-other things, so Neil Jerram and Ludovic Courtès stepped up to take on
-the primary maintenance responsibility. Jerram and Courtès were joined
-by Andy Wingo in late 2009.
+other things, so Neil Jerram and Ludovic
+@iftex
+Court@`es
+@end iftex
+@ifnottex
+Courtès
+@end ifnottex
+stepped up to take on the primary maintenance responsibility. Jerram and
+@iftex
+Court@`es
+@end iftex
+@ifnottex
+Courtès
+@end ifnottex
+were joined by Andy Wingo in late 2009.
 
 Of course, a large part of the actual work on Guile has come from
 other contributors too numerous to mention, but without whom the world