Make table headers bold; fix a typo

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25974 a1c6a512-1295-4272-9138-f99709370657
diff --git a/manual/advanced_topics/viewports/grayscale-vp-syntax.tex b/manual/advanced_topics/viewports/grayscale-vp-syntax.tex
index ec8db02..d2c2907 100644
--- a/manual/advanced_topics/viewports/grayscale-vp-syntax.tex
+++ b/manual/advanced_topics/viewports/grayscale-vp-syntax.tex
@@ -20,7 +20,7 @@
     %sthat point. The lines will scroll if this text does not fit in the viewport.
     %sThe user font is used, as are the default foreground/background shades.
 \end{example}
-\begin{rbtabular}{.75\textwidth}{XX}{Viewport definition & Default value}{}{}
+\begin{rbtabular}{.75\textwidth}{XX}{\textbf{Viewport definition} & \textbf{Default value}}{}{}
   width/height & remaining part of screen \\
   font & user defined \\
   shade & black foreground on white background \\