Improve typesetting and fix a typo

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24103 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 9f15b51..ec8db02 100644
--- a/manual/advanced_topics/viewports/grayscale-vp-syntax.tex
+++ b/manual/advanced_topics/viewports/grayscale-vp-syntax.tex
@@ -3,14 +3,14 @@
 {\config{\%V}}{\textbar}x{\textbar}y{\textbar}[width]{\textbar}[height]{\textbar}[font]{\textbar}[fgshade]{\textbar}[bgshade]{\textbar}%
 
     \begin{itemize}
-      \item 'fgshade' and bgshade are numbers in the range '0' (= black) to '3'
+      \item `fgshade' and `bgshade' are numbers in the range 0 (= black) to 3
       (= white).
-      \item 'font' is a number - '0' is the built-in system font, '1' is the
+      \item `font' is a number: 0 is the built-in system font, 1 is the
       user-selected font.
       \item Only the coordinates \emph{have} to be specified. Leaving the other
       definitions blank will set them to their default values.
-      \note{The correct number of {\textbar}s with hyphens in blank fields
-      are still needed in any case.}
+      \note{The correct number of `{\textbar}'s (vertical bars) with hyphens in
+      blank fields are still needed in any case.}
     \end{itemize}
 
 \begin{example}
@@ -25,3 +25,4 @@
   font & user defined \\
   shade & black foreground on white background \\
 \end{rbtabular}
+