Fix a variety of small markup nits.
diff --git a/Doc/lib/libgettext.tex b/Doc/lib/libgettext.tex
index 3aa31d2..e98d9f6 100644
--- a/Doc/lib/libgettext.tex
+++ b/Doc/lib/libgettext.tex
@@ -446,7 +446,7 @@
scans all your Python source code looking for the strings you
previously marked as translatable. It is similar to the GNU
\program{gettext} program except that it understands all the
-intricacies of Python source code, but knows nothing about C or C++
+intricacies of Python source code, but knows nothing about C or \Cpp
source code. You don't need GNU \code{gettext} unless you're also
going to be translating C code (such as C extension modules).